The suspects in the Boston Marathon bombing were likely planning other attacks, Boston police commissioner Ed Davis said Sunday.
The brothers, Tamerlan and Dzhokhar Tsarnaev, “were going to attack other individuals,” Davis told the CBS program “Face the Nation” on Sunday, adding that authorities found an arsenal of homemade explosives following a gun battle between police and the suspects last week in Watertown, Massachusetts.
Davis told The Boston Globe it was his “belief that they were already manufacturing explosive devices. Further violent acts were inevitable.”
The suspects hadn’t planted bombs for no reason, the commissioner said. Police found rifles, handguns and at least six bombs at the scene of the first shootout with the brothers, where Tamerlan, the older brother, was killed.
Videos released by the Boston Police on Sunday showed one of the suspects dropping his bag at the location of the explosion. Additional footage from the ensuing manhunt showed police tracking and finding Dzhokhar Tsarnaev in a boat, where he eventually surrendered after a 90-minute shootout.
Additional footage, taken by security officials from the air, shows the 19-year-old lying under a tarp on the deck of the boat. Police then used a robot to remove the tarp and expose Tsarnaev, after which a stun grenade was thrown in his direction. He was caught and taken to the hospital after he surrendered.
Since his arrest, he has been guarded by armed officers while he recovers at a Boston hospital. He is in serious condition and hasn’t been able to communicate with investigators.
The video clearly puts Tsarnaev at the scene of the attack, Massachusetts Gov. Deval Patrick said Sunday.
“It does seem to be pretty clear that this suspect took the backpack off, put it down, did not react when the first explosion went off and then moved away from the backpack in time for the second explosion,” Patrick said. “It’s pretty clear about his involvement and pretty chilling, frankly.”
He added, however, that he hasn’t viewed all the tapes, but had been briefed by law enforcement officials about them.
The brothers are also suspected of killing a Massachusetts Institute of Technology police officer Thursday and severely injuring a transit officer.
Patrick said Sunday on “Face the Nation” that law enforcement officials believe the immediate threat ended when police killed Tamerlan Tsarnaev and captured Dzhokhar.
The governor said he has no idea why someone would deliberately harm “innocent men, women and children in the way that these two fellows did.”
On Saturday, Patrick appeared on the field at Fenway Park with dozens of local and state police before the Boston Red Sox’s first home game since the bombings.
The Associated Press contributed to this report.