Federal law enforcement officials are considering releasing images of one or possibly two persons of interest in the Boston Marathon bombings, Fox News has learned.

FBI investigators have been scouring video and still images taken around the finish line, where two bombs exploded during Monday's race, killing three and injuring 176. Authorities believe at least one of the bombs was a sealed pressure cooker laden with explosives and shrapnel, and may have been concealed in a backpack.