Found on video surveillance footage, the images of the two men in baseball caps will forever be remembered as the public’s first sight of the Boston Marathon bombers.

One is dead, the other – as of press time – on the run.

The somewhat blurry, but still detailed photos and video, depicted one young man in a dark cap and another in a white cap worn backward, both wearing backpacks and one walking behind the other on the sidewalk near the finish line as marathoners run by.

After the FBI and Boston authorities released those images to the public, we now know their names – brothers: 26-year-old Tamerlan Tsarnaev and 19-year-old Dzhokar Tsarnaev. The two were suspect No. 1 and suspect No. 2, respectively.

The older Tsarnaev died in a Thursday night shootout with police. The younger apparently escaped and is being pursued by an army of law enforcement officers. The pursuit began after the men allegedly hurled explosives at pursuers after killing Massachusetts Institute of Technology police Officer Sean Collier, robbing a convenience store and hijacking a car.

The pursuit virtually shut down the area and surrounding communities as law enforcement did a door-to-door check for Tsarnaev, and the manhunt continued into the night.