Boston police say they believe suspect to be a terrorist who came to kill people

(A report from Investigators who released the pictures and video of two suspects in the Boston Marathon bombing on Thursday, recording the public help in recognition of the two men puting backpacks and baseball caps in the multitude a minutes before bombs exploded near the end edge.

A 30-second video shows the men known only as Suspect 1 and Suspect 2 walking single file a few paces apart along Boylston Street in central Boston. One wears a dark baseball cap and sunglasses. The other has a white baseball cap looked toward back.

The time prompt is 2:37 p.m., exactly 13 minutes before the two bombs exploded with nails and ball named tore through the multitude, the explosion killing three people and injured 176 including about 10 who suffered amputations.

"The second Suspect group down a backpack at the site of the second explosion," admitted by Richard DesLauriers, the FBI special agent in charge in Boston. That image was kept from the public.

The FBI received a "high volume" of phone calls and web traffic after releasing the pictures, a bureau spokeswoman said. Statistics would be reported on Friday, she said.

The Globe has sourced the information to an official with knowledge of the investigation.

Shortly after, gunfire and explosions erupted in streets in Watertown, north of the university.

The pictures were released a few hours after President Barack Obama delivered a stirring address to an interfaith service at a Boston cathedral, telling the city, "You will run again."

He promised resilience in a message to Boston and by extension an entire country unsettled by a momentous week.