gun rights advocates pressed the president on how he's working to make america safer. mr. obama said he is not trying to take guns away from law abiding owners. south korea is now blasting propaganda broadcasts at the dmz directed at north korea. this in response to pyongyang's claim it detonated a hydrogen bomb this week. the south has also increased its military defensive posture. the north has at times reacted to these broadcasts with artillery fire. at least 50 people are dead in a truck bombing in western libya. the town's mayor says the vehicle plowed into a group of about 400 people at a police training center and then exploded. authorities say they don't know yet who's behind it. new video and pictures from syria are disturbing and they're reminding people of world war ii concentration camps. the images we'll show you are