"Somebody out there knows these individuals as friends, neighbors, co-workers or family members," Boston FBI Special Agent in Charge Richard DesLauriers said at a Thursday evening briefing.
"Though it may be difficult, the nation is counting on those with information to come forward and provide it to us.
FBI
These are among the photos of the suspects in the Boston Marathon bombing released by the FBI.
"We
consider them to be armed and extremely dangerous," DesLauriers added.
"No one should approach them...If you see these men, contact law
enforcement."
The images show two men in baseball caps and dark
jackets who were seen walking together through the crowd at Monday's
iconic race.
