The Federal Bureau of Investigation doesn’t know the identity of the individuals who perpetrated this week’s Boston Marathon Bombing but its agents believe they have photographs and videos of the two men taken immediately prior to the attack.

Three days after a pair of “pressure cooker” bombs detonated near the finish line of the Boston Marathon – killing three people and injuring nearly 200 more – the FBI released photographs of its two top suspects, along with a request for assistance in identifying them.

“Somebody out there knows these individuals as friends, neighbors, co-workers or family members of the suspects,” Boston FBI leader Richard DesLauriers said. “Though it may be difficult, the nation is counting on those with information to come forward and provide it to us.”

DesLauriers said the FBI had video of one of the suspects dropping his backpack at the site of one of the explosions. In fact a picture shows the suspect moving behind one of the three victims of the attack, eight-year-old Richard Martin.

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And here’s the video of the suspects …

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In addition to these efforts, the FBI is attempting to identify and trace the materials used in the manufacture of the homemade devices, as well as any cellular data that might assist them in determining how the devices were detonated.

Meanwhile, conspiracy theorists – including – has produced pictures questioning the official version of events.

“In not only ignoring but aggressively attempting to discredit the photos showing men who are likely employees of the private security firm Craft International on the scene of the bombings engaged in some kind of drill, the FBI has signaled its intention to continue the cover-up of what really happened,” the website noted.