Boston TV station posts pictures showing bag near blast site

A photo sent to WHDH-TV shows a bag next to a mailbox along the Boston Marathon route.
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A Boston television has published photographs from a viewer that may show the second bomb that exploded during Monday's Boston Marathon.

WHDH-TV received the pictures Tuesday, taken just before and after the bombs exploded on Boylston Street, near the finish line of the marathon. One photograph shows a bag next to a mailbox, on the outside of a barricade along the marathon route.

A second image, which has been blurred by the television station due to graphic images of injuries to spectators, shows no sign of the bag, but there is debris scattered in the area and people reacting to the hectic scene.

The viewer told WHDH the pictures may have been taken an hour or more apart. The station sent the photographs to the FBI who is investigating the explosions.

Bomb fragment pictured

An intelligence bulletin issued to law enforcement includes a picture of a mangled pressure cooker and a torn black bag that the FBI says were part of a bomb that exploded during the Boston Marathon.

The bulletin was obtained by The Associated Press.

The FBI says it has evidence that indicates one of the bombs that exploded in the Boston Marathon was contained in a pressure cooker with nails and ball bearings, and it was hidden in a backpack.

The FBI says the other explosive was in a metal container, but there wasn't enough evidence to indicate that it was a pressure cooker.

It was not known what was used to set off the two explosives that killed three people Monday and injured more than 170 others.

Boston Marathon bombings: Support and resources

(The Associated Press and WHDH-TV contributed to this report.)