will be key to piece this all together. phil black in moscow, thanks so much. here later today, a memorial service for another one of the victims, at noon vice president joe biden will attend a service for sean collier. he is the m.i.t. officer killed during the manhunt for the suspects. meanwhile later this afternoon, the house intelligence committee will receive a full briefing on the terror attacks. in our next half hour we'll talk to democratic congressman benny thompson of mississippi. he was briefed by the fbi on the boston terror attack. we'll find out what he has to say. zoraida? >> thank you, john. six minutes past the hour. a story developing while you were sleeping in bangladesh. an eight story commercial building collapsing on the outskirts of the capital city of dhaka. local reports say at least 70 people have been killed. hundreds more are injured. rescue workers are now digging through the rubble, as you can see there. they are trying to find survivors who may still be trapped underneath all the rubble. and the mystery surrounding