luther king junior monument in washington. here in washington, throughout the nation, bells rang at 3:00 p.m. eastern to mark a watershed moment in the nation s history. correspondent doug mcelway looks at the 50th anniversary of a civil rights turning point. [ bell ringing ] reporter: the symbolism profound, ringing the bell that used to be above the 16th street baptist church where four little girls were killed in a bombing two weeks after the 1963 march. also profound, the voices in the crowd, people like gilbert lyons, he was there that day, veteran of the korean war. left, the country was segregated, seemed like it was worse. people in japan treat you like you supposed to be, human beings. come back in my own country in uniform, sit there, say i can t feed you. reporter: today s ceremony an opportunity to pass memories of the injustices onto a younger
0 simultaneous truck bombings in tanzania in 1998, which left 223 dead, more than 4,000 injured. this pharmaceutical factory in the sudan, believed at the time to produce chemical weapons and training camps in afghanistan were bombed in retaliation. with hindsight, observers say clinton missile strikes strengthened the bond between the taliban and al qaeda, paving the way for the uss cole bombing and a chance to bring terrorism to america s shores. you use limited military power to send a signal. in this case it was that al qaeda will not be allowed to threaten the united states. the immediate aftermath is that the administration becomes embolden. reporter: reagan administration took a similar attack after this. two of the dead were serviceman, many of the injured disabled. moammar gadhafi, president reagan launched strikes on benghazi and tripoli. today we have done what we had to do. if necessary, we shall do it again. reporter: two years later, libyan bomb on pan am flight o