Monday marks one week since the deadly bombings at the Boston marathon that killed three people and injured more than 180. Bombing suspect Dzhokhar Tsarnaev, 19, remains hospitalized in serious but stable condition. He has reportedly communicated with federal investigators through writing from his hospital bed.
Tsarnaev is said to be answering questions about any accomplices and other unexploded bombs, several media outlets are reporting.
Tsarnaev was found wounded and bloody hiding in a boat parked behind a home in Watertown, a Boston suburb authorities had shut down to conduct house-by-house searches.
Boston Police Commissioner Ed Davis said Sunday that investigators believe Tsarnaev and his brother, Tamerlan, were likely planning other attacks. Davis told CBS' "Face the Nation" that authorities found an arsenal of homemade explosives after a gun battle between police and the suspects.
Authorities have said they believe the bombs used were fashioned out of ordinary kitchen pressure cookers packed with explosives, nails, ball bearings and metal shards. They say the bombs were hidden in backpacks and left on the ground.
Massachusetts Gov. Deval Patrick said surveillance video from the bombing shows Dzhokhar Tsarnaev dropping his backpack and calmly walking away from it before the bomb inside exploded. "It's pretty clear about his involvement and pretty chilling, frankly," Patrick said on NBC's "Meet the Press."
There'll be a moment of silence Monday at 2:50 p.m., the time the first bomb exploded.
Meanwhile, authorities are waiting to question the widow of bombing suspect Tamerlan Tsarnaev, who was killed Friday while trying to get away from police.