Last Updated Sep 19, 2016 8:20 AM EDT
ELIZABETH, N.J. -- One of five devices found in a backpack near a train station in Elizabeth, New Jersey, exploded while a bomb squad robot was attempting to disarm it, the city’s mayor said.
Elizabeth Mayor Christian Bollwage said the blew up shortly after 12:30 a.m. Monday. The FBI was leading the investigation and working to disarm the other four devices.
Bollwage told CBS News the explosion was unintentional.
There were no reports of injuries. Bollwage said to expect more detonations. He added that there was no damage to the train infrastructure nearby.
Bollwage also said police were reviewing surveillance from a nearby bar.
He said two men called police and reported seeing wires and a pipe coming out of a package after finding it in trash around 8:30 p.m. Sunday. But, he told CBS News, the men didn’t see who dropped the device in the trash.
The men, who were scavengers, left the package under the tracks and ran to a police station to report what they had found, reports says CBS New York.
New Jersey Transit says service has been suspended between Newark Liberty Airport and Elizabeth. New York’s emergency management department says New Jersey-bound Amtrak trains are being held at New York’s Penn Station, interrupting some service on the busy Northeast Corridor.
The discovery of the suspicious package came a day after, and an unexploded pressure-cooker device was found four blocks away. Officials have identified a suspect in the blast, , and say he is being sought in connection with the Elizabeth discovery, as well as an explosion at on Saturday.
Bollwage said that he wasn’t willing to say that Elizabeth had become a target, and that it was possible that someone worried about the authorities was trying to get rid of the package.
“I’m extremely concerned for the residents of the community, but more importantly extremely concerned for everyone in the state and country where someone can just go and drop a backpack into a garbage can that has multiple explosives in it with no timers and then you have to wonder how many people could have been hurt,” Bollwage said.