At least one was a pressure cooker that contained BBs and nails, the affidavit said.
WSJ: Dzhokhar Tsarnaev Charged by U.S. Prosecutors in Boston Marathon Attack
The device also had fragments that may have included nails, BBs and ball bearings, the agency said.
CNN: Healing in Boston as investigators seek 2 seen near bombing
"They look like BBs, " he said, adding that the balls were distinct from the shrapnel thrown up from debris on the street.
Park learned to program motion-graphics synchronized to dance music and ran a BBS, an electronic bulletin board system, the precursor to the Internet.
Being able to access the internet from home -- again, that old Atari had seen some BBS action in its day -- changed everything.
The marathon bombs, the affidavit said, were "low-grade explosives that were housed in pressure cookers" and packed with BBs, nails, and green-colored hobby fuse.
WSJ: Dzhokhar Tsarnaev Charged by U.S. Prosecutors in Boston Marathon Attack
The Federal Bureau of Investigation already has described other parts of the bombs, which were placed in pressure cookers and packed with nails and BBs.
Three people were killed, and more than 170 injured as nails, ball bearings, BBs and shards of broken glass were blasted through the viewing area.
The bombs used during the Boston Marathon, the federal affidavit said, were "low-grade explosives that were housed in pressure cookers" and packed with BBs, nails and green-colored hobby fuse.
WSJ: Dzhokhar Tsarnaev Charged by U.S. Prosecutors in Boston Marathon Attack
The FBI said late Tuesday that what appeared to be fragments of ball bearings, or BBs, and nails had been recovered and had possibly been contained in a pressure cooker.
"If you put little BBs that can penetrate, you've potentially penetrated in dozens of places, " he said, and it can be difficult to tell whether those pellets have cut through bowel tissue.
At their recent rallies, the most prominent new hardline group, the Buddhist Strength Force (Bodu Bala Sena, BBS) have used coarse, derogatory language to describe Muslim imams and have told the Sinhalese majority not to rent property to Muslims.
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