tara mergener is in washington with more. good morning, tara. >> reporter: good morning, michelle. well, president obama calls so-called loose nukes the number one security issue in the world. he's enlisting the help of dozens of countries to reduce the threat. >> his excellency, nicklaus sarkozy. >> reporter: president obama hopes by the end of today world leaders will agree on a plan to keep nuclear materials out of the hands of terrorists. >> the threat of nuclear terrorism is real, it is serious, it is growing. >> reporter: the president's counterterrorism chief stressed the need for urgency monday. he warned that al qaeda is actively looking for the key ingredients for a nuclear bomb and someone who can assemble it. >> we cannot wait any longer. >> reporter: as part of a joint effort to secure the loose materials within four years, canada agreed to send its spent nuclear fuel to the u.s., the ukrain also agreed to give up its weapons grade uranium. >> this is something the united states has tried to make happen for more than ten years. the material is enough to construct several nuclear weapons. >> reporter: the obama administration also plans to lead by example. the u.s. and russia are expected to sign a deal today reducing stocks of weapons grade plutonium. and while iran may not be on the official agenda, it's on the minds of many. after a one-on-one session with president obama, white house officials say china is now prepared to work with the u.s. on a set of potential sanctions against iran. the goal is making it clear that nuclear defiance will not be tolerated. no major policy changes are expected to come out of this event. the white house says it's more about getting everyone on the same page. michelle, back to you. >> tara mergener in washington. thank you. navy officials are investigating the crash of a training plain in northern georgia that killed at least three people. the twin engine navy jet crashed yesterday afternoon near the north carolina/tennessee border. no one on the ground was injured. three bodies have been recovered an it's believed a fourth person was on board. the t-39-n was based out of pensacola. through the night, recovery crews worked to remove the remaining victims from that west virginia coal mine disaster. a memorial service was held at the state capitol yesterday for 29 victims of last week's explosion. the blast was the worst coal mining disaster in this country since 1970. federal officials arrived yesterday. the mine has racked up a string of safety violations. that tennessee woman who adopted a russian boy and then sent him back isn't talking. the boy was sent back to russia on a plane by himself last week. torry hansen wrote a note claiming the 7-year-old is mentally unstable and violent. hansen says she won't talk unless charges are filed. >> that's the only way we'll get to talk to her it looks like. so i guess we're kind of getting our hand forced here and that's the only thing i know to do at this point. >> but no federal laws have been broken, so it's up to local officials to press charges. there are allegations of abuse, but the boy's back in russia. russian has threatened to suspend all adoptions with the u.s. the acting president in poland is naming replacements for the officials killed in saturday's plane crash. meanwhile, the body of president lech kaczynski will lie in state at the presidential palace beginning today. a funeral is planned for saturday. he and 95 others were killed in the crash. investigators believe human error is to blame. the pilots were apparently warned not to try to land due to stormy weather. in indonesia this morning, a passenger jet skidded off the runway. the 737 was landing in heavy rain about 2,000 miles east of jakarta. there were 109 people on board when the jet skidded into a canal and broke in half. some 20 people were injured. most with bruises. and only a few broken bones. the vatican has unveiled a new policy on how the clergy should respond to cases of sex abuse. it instructs bishops and others to report such crimes to police if required to do so by law. that's a first for the vatican. the vatican secretary of state cardinal bertoni says celibacy isn't the cause of pedophilia, it's homosexuality. bertoni was speaking during a visit to chili. he called for the behavior of priests who molest children as scandalous. and the vatican has made amends with the beatles. the vatican newspaper paid tribute to the band on the 40th anniversary of its breakup. the vatican says it's true the band took drugs, lived desolate lives and claimed they were more famous than jesus, but listening to their songs, all of that seems very distant. on the cbs "moneywatch," there was profit taking in asia this morning and emily smith is here in new york with that and more. emily, good morning. >> reporter: good morning. well, most asian markets fell today on concerns the global economic recovery may not be able to hold. the nikkei lost about 1%. today wall street gets an earnings report from chip maker intel. monday the dow gained 8 points to close above 11,000 for the first time in a year and a half. the nasdaq was up 3 and change. a bill to restore benefits to the long term unemployed has advanced in the senate after several republicans joined democrats to end a filibuster. both parties blame each other for allowing the program to lapse last week. unless it passes, about a million americans will lose their benefits this month alone. president obama is about to lose a close ally in organized labor. andy stern, president of 2.2 million strong service employees international union, will reportedly step down from his post at age 60 after 14 years. the sciu spent about $60 million to help mr. obama win the white house. twitter is trying to get profitable. the social networking site will begin rolling out ads to users today. initial advertisers include starbucks, virgin atlantic and best buy. until now, the 4-year-old company has resisted going the advertising route. and there's good news for ipad owners boarding a plane. unlike traditional laptops that have to go through separate screenings, the tsa says passengers can keep ipads in their carry-on luggage when going through security checkpoints. airport officials say the ipad is so thin it won't block images when passing through screening machines. and tiger's return turned out to be the ratings bonanza everyone expected. cbs sports coverage of the final round of the masters was up 36% over last year. generating the highest ratings in nine years. and i didn't plan to watch it, but everywhere i went, it was on the tvs, so -- >> i watched it. i never do, but i did. >> lots of people did. >> emily smith here in new york. thanks. and just ahead on the "morning news," football's big ben escapes assault charges. plus, a warning for young women on drinking and a possible link to breast cancer. but first katie couric has a preview of tonight's "cbs evening news." >> i'm katie couric in port-au-prince. it has been three months since the earthquake. what's become of the children of haiti? as you can see, some of the lucky ones are back in school. i'll have that story and much more tonight only on the "cbs evening news." ep aid and you're still fighting to sleep in the middle of the night, why would you go one more round using it ? you don't need a rematch-- but a re-think-- with lunesta. lunesta is different. it keys into receptors that support sleep, setting your sleep process in motion. lunesta helps you get the restful sleep you need. when taking lunesta, don't drive or operate machinery until you feel fully awake. walking, eating, driving or engaging in other activities while asleep without remembering it the next day have been reported. abnormal behaviors may include aggressiveness, agitation, hallucinations or confusion. in depressed patients, worsening of depression, including risk of suicide, may occur. alcohol may increase these 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from harm. she was not injured, but admitted she was afraid of the big cats. conan o'brien is expected to return to tv in november. o'brien was dropped as the host of nbc's "tonight show" after nearly eight months because of low ratings. now, after a multimillion-dollar buyout, conan was widely expected to go to the fox network. but the comedian surprised everyone by signing up on a show to do it on tbs on cable. >> he's getting his own network. i think we'll see tbs turn into the conan network. >> now, some say if conan gets the 2 million viewers he had on the tonight show, he'll be a huge hit on cable. there is new information out this morning for women about alcohol and breast cancer. a study by the journal "pediatrics" links heavy drinking to the risk of breast cancer, especially in younger women. sandra hughes reports. >> reporter: there is nothing to toast in the latest findings that alcohol may be linked to be sunshine breast disease in young women. a new study that looked at 16 to 23-year-olds found the more they drank, the higher their risk. benign breast disease is a mixed group of different conditions like lumps or cysts and they can be a warning sign. >> they're thought to be just a marker of increased risk of breast cancer. so when we consider them all together, women on average have about a 50% increased risk of developing breast cancer. >> reporter: young women who drank six to seven days per week had more than five times the risk of benign breast disease than young women who never drank. women who drank three to five days a week have three times the risk. >> this says women should really consider modifying their alcohol intake. >> reporter: researchers believe the connection between alcohol and breast cancer can be found in the hormone estrogen. drinking increases estrogen levels, so drinking more increases a woman's risk. the findings are a wake-up call after a study last year that found binge drinking among college women in their early 20s reached a whopping 38% in 2006. but with all this evidence, it still may be hard to convince young women to abstain. >> if we listened to every report that came out, you'd have to stop living your life. >> maybe i should start thinking about it since i'm drinking in college. >> reporter: researchers hope the study will at least give young women the facts to consider before they order that next drink. sandra hughes, cbs news, los angeles. ben roethlisberger is not being charged with sexual assault in georgia. roethlisberger says he is truly sorry and is happy to put the case behind him. a 20-year-old college student accused him of sexually assaulting her inside a night club bathroom in march. but the district attorney said yesterday there was not enough evidence to prosecute. >> we are not condoning mr. roethlisberger's actions that night, but we do not prosecute morals, we prosecute crimes. >> roethlisberger will meet soon with nfl commissioner roger goodell who might punish him for violating the player's code of conduct. straight ahead, your tuesday morning weather. and in sports, the heat steal a win in philadelphia. 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[ female announcer ] and save up to $15 off your refills. go to nasonex.com for details, terms and conditions. here's a look at the weather in some cities around the country. new york, cloudy at 58. miami, 82. chicago, sunny, 72. denver, &owers at 60. los angeles, 66. time now for a check on the national forecast. the latest satellite picture shows skies clearing across the southwest after yesterday's rain. it's a gray and stormy morning across the northwest and northern rockies. and it's cloudy over the northeast and great lakes. now, later today, parts of the northeast can expect a few sprinkles. it will be sunny from the ohio valley and mid-atlantic states southward to the gulf coast. showers will be scattered across the western high plains. and it will be cold and snowy around the northern rockies. in sports, with the playoffs starting next week, miami had to pull out a close win in the nba. the heat got the go-ahead basket in the closing seconds against philadelphia and miami held on for the victory 107-105 as they battle for fifth place in the eastern conference. atlanta's joe johnson scored 31 points against milwaukee as the hawks beat the bucks 104-96. the two teams could meet in a first round playoff series starting monday. in baseball, they went extra innings in cleveland. nelson cruz smashed a two run homer in the tenth against the indians. and texas beat cleveland 4-2. cruz is tied for the major league lead in home runs with five. and in the tenth inning, cincinnati's scott roland singled to drive in the go-ahead run and the reds held on to beat the marlins 6-5. both teams have won four games and lost three so far this season. when we return, we'll take another look at this morning's top stories. and nuclear defiance. iran vows to continue enriching uranium despite the threat of sanctions. sanctions. s i was always confident in the way i got my taxes done. and i never figured there was anything wrong. now that we're engaged, i talked him into going to h&r block with me. i was skeptical at first. they found tax credits that i could have gotten. on his 2008 taxes, h&r block found a personal exemption, a stimulus credit and a hope education credit... worth two thousand fifty two dollars. wow. h&r block caught it like right off the bat. make sure nothing is missed on your tax return. she was right. i was wrong. just go to someone you trust. definitely. h&r block. get it right. on the "cbs morning news," here's a look at today's weather. a few scattered showers will dampen parts of the northeast. it will be sunny and warm from the mid-atlantic states to the gulf coast. showers are likely across the western plains. southwest turns sunny. here's another look at this morning's top stories. on wall street, the dow opens above 11,000 for the first time in 18 months. it hit a 12 year low in march last year, but since then, has rebounded almost 70%. and a two day summit on preventing nuclear terrorism hosted by president obama wraps up today. 47 nations attended. the president says the threat of nuclear terrorism is serious and growing. another major topic of conversation at the summit is iran's controversial nuclear ambitions. the white house is pushing for strong international action. elizabeth palmer reports. >> reporter: only in iran does uranium enrichment rate this kind of pomp. on national nuclear day, mahmoud ahmadinejad told the country it should feel proud. the head of the nuclear agency who got his ph.d. at m.i.t. made a candid admission in a rare interview with cbs news. >> of course sanctions will affect us, but it only will delay our projects. it will not stop our projects. >> they hurt. >> of course they will hurt, but then we will have to come up with our own manufacturing systems. >> reporter: iran already enriches uranium in one plant. and recently it announced it would build six more. it says it just wants fuel for nuclear power stations. but the u.s. suspects it secretly plans to build a bomb. >> are you trying to make any kind of weapon? >> no. we have indicated this many times, not me, our president, our supreme leader. this is against our tenants, it's against our religion. >> reporter: the u.s. and its allies might have more faith in that argument if iran didn't do things like this. publicly unveil a new centrifuge that would enrich more uranium even faster, or say things like this. >> any military encounter with iran will create consequences that are beyond anybody's imagination. >> like? >> it can put the entire region on fire. >> reporter: all tactics that erode western confidence in iran but please the crowds at home. elizabeth palmer, cbs news, tehran. astronauts at the international space station got an early start this morning. they began the third and final spacewalk of the mission an hour ahead of schedule. they're completing the installation of a new ammonium coolant tank aboard the station. the old tank will be moved to the cargo bay and be returned to earth next week. ♪ earlier there was a recital, the two japanese astronauts performed traditional music. it was to mark the first time two japanese astronauts are flying in space together. you're watching the "cbs morning news." bs morning news." ♪ row to finish what you started today. for the aches and sleeplessness in between, there's new motrin pm. no other medicine, not even advil pm, is more effective for pain and sleeplessness. new motrin pm. is all you'll find in sun crystals®. the 100% natural sweetener made from just pure cane sugar and the sweet stevia plant. nothing artificial and only 5 calories per packet. sun crystals® all natural sweetener. can you believe how fast kids grow these days? 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