Arsenal of explosives suggests Tsarnaev brothers may have planned more bombings

The arsenal of explosives recovered by investigators in Watertown, Mass. and Dartmouth suggests that the Boston Marathon bombing suspects may have been planning more bombing attacks.

Read more: Boston Marathon bombing suspect Dzhokhar Tsarnaev charged

Law enforcement officials found multiple bombs at the scene of the shootout in Watertown and inside the car used by Tamerlan and Dzhokhar Tsarnaev, the two Cambridge men suspected of carrying out the Boston Marathon bombings.

According to an FBI affidavit filed Sunday, investigators recovered at least 2 improved explosive devices [IEDs] hurled at police during a car chase down Dexter Street.

Authorities also recovered 2 unexploded bombs and and “remnants of numerous exploded IEDs” on Laurel Street, where the Tsarnaev brothers waged a fierce gun battle with police early Friday morning. One of the devices detonated was a pressure cooker bomb containing metallic ball bearings and similar to the ones used in the Boston Marathon explosions that killed 3 people and wounded at least 200 others on April 15, 2013.

Read more: Boston Marathon bombing suspect captured alive after leaving a trail of bloodshed in Cambridge, Watertown

On Sunday, the FBI searched the dorm room of Dzhokhar Tsarnaev at the University of Massachusetts at Dartmouth. There, investigators found “a large pyrotechnic, a black jacket and white hat of the same general appearance as those worn by Bomber Two at the Boston Marathon on April 15, 2013, and BBs [ball bearings].”

Boston Police Commissioner Ed Davis told the Boston Globe that he believes the Tsarnaev brothers were plotting more bombing attacks before the FBI’s release of their photos on Thursday “forced them out of their hideout.”

“It’s my belief that they were already manufacturing explosive devices. Further violent acts were inevitable,” said Davis. “[They] were not making those explosives for nothing…There was a plan there.”

The FBI affidavit confirmed that the two bombs used in the Boston Marathon attack were “low-grade explosives that were housed in pressure cookers” containing “metallic BBs and nails” and “green-colored hobby fuse[s].”

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