FBI Special Agent Richard DesLauriers said at a Thursday evening press conference that investigators have pinpointed two different suspects in the Boston Marathon bombings who "appeared to be associated."
Relying on video footage, DesLauriers said "suspect one" was donning a dark hat while "suspect two" was wearing a white hat. Suspect two was seen in video footage setting down a backpack at the site of the second explosion, right in front of the Forum restaurant.
And here are photos of the suspects. The FBI is warning civilians NOT to try to apprehend either of these suspects themselves. They are considered to be armed and dangerous. Instead, if you come into contact with either of these suspects and/or have information that can help authorities apprehend these suspects, please visit bostonmarathontips.fbi.gov and/or call 1-800-CALL-FBI.
Here's what we now know about the suspects, and about Monday's attack.
The images show two men in baseball caps and dark jackets who were seen walking together through the crowd at Monday's iconic race.
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." [...]
Investigators are casting a wide net for clues. The FBI was canvassing hobby stores in the Boston area to determine whether electrical components in the bombs were bought there, NBC News learned.
Forensic work from the blast zone has helped authorities identify major components of the bombs.
They were housed in metal containers — at least one an everyday kitchen pressure cooker — and studded with metal, including fine nails or brads, to make the devices more lethal. A battery pack typically used on toy cars and a circuit board were also recovered.
Again, if you have information that can help authorities catch these suspects, use the contact info above to reach the FBI. Do NOT try to arrest these suspects yourself.
In the past 72 hours, we've seen plenty of false leads and misinformation. It's reassuring to see the FBI step forward with real, credible information. Now, it's just a matter of how long before this leads to an arrest.