boston bombing suspects*(Via NBC News) – The FBI has released video and photos of two “armed and extremely dangerous” suspects in the Boston Marathon bombing and appealed for the public’s help in identifying them.

The images show two men in baseball caps and dark jackets who were seen walking together through the crowd at Monday’s iconic race.

These are among the photos of the suspects in the Boston Marathon bombing released by the FBI.

One of them set down a backpack at the site of the second blast, minutes before the explosion.

“Somebody out there knows these individuals…though it may be difficult, the nation is counting on those with information to come forward and provide it to us,” Boston FBI Special Agent in Charge Richard DesLauriers said at a Thursday evening briefing.

“We consider them to be armed and extremely dangerous,” DesLauriers said of the men. “No one should approach them…If you see these men, contact law enforcement.”

He asked the public to call a hotline, 1-800-CALL-FBI, with tips or visit the bureau’s website, bostonmarathontips.fbi.gov.

DesLauriers said investigators initially zeroed in on one of the men. By examining photos and videos of the marathon crowd, they were able to identify a second suspect.

“They appear to be associated,” he said.

Read/learn more at NBCnews.com.

Watch video of the suspects:

For more info on the case, visit the FBI’s website.