Police officer killed in MIT campus shooting
Egyptian Jewish leader's funeral held in Cairo
LA university evacuated due to bomb threat
Explosion hits Texas fertilizer plant
Baroness Thatcher's funeral
FBI releases Boston Marathon bomb details
Suspicious envelope found in US Senate office building
Press conference held in Boston over marathon bombing
Thatcher's funeral held at St Paul's Cathedral
Boston mourns bombing victims
Security beefed up worldwide after Boston blasts
French Army's AMX-10RC vehicle in maintenance
Obama delivers statement on Boston Marathon explosions
File photos: horrible scenes in 9/11 terrorist attacks
Explosions at Boston Marathon kill 3
Spanish anti-monarchy rally attracts thousands
