The FBI released a photo Wednesday of the two people who might have handled the pressure-cooker bomb believed to have been planted by Ahmad Kahn Rahami on West 27th Street between 6th and 7th Avenues in Chelsea.

Within an hour after the explosion on West 23rd Street that injured 29 people, another un-exploded bomb made from a pressure-cooker and a cellphone was found on the sidewalk.

The image taken from surveillance footage shows what appears to be two well-groomed men confidently walking down the sidewalk on Sept. 17.

The two men, caught on surveillance video footage, are considered potential witnesses, not suspects, in the bombing, said Robert Boyce, chief of detectives for the New York City Police Department.

"They looked like they were two gentlemen just strolling up and down Seventh Avenue at the time. We have no information that would link them to this at all," Boyce said at a briefing. "However, we still want to talk to them, obviously."

Boyce said the two men were seen picking up the bag containing the device, removing it and then leaving with the bag, for reasons that remains unclear. 

"Once they picked up the bag, they seemed incredulous they had actually picked this up off the street and they walked off with it," Boyce said. "So we'll find out, we'll put their images out. Hopefully we can get them identified."

Anyone with information concerning the case is asked call the FBI’s toll-free tip line at 1-800-225-5324 (1-800-CALL-FBI), your local law enforcement or the nearest American Embassy or Consulate.