A device found in a backpack near a train station in New Jersey exploded early Monday while a bomb squad robot was trying to disarm it, authorities said.
Christian Bollwage, the mayor of Elizabeth, said that two men found a bag containing five devices in a trash can at about 8:30 p.m. Sunday. The bag had wires and a pipe protruding from it.
Bollwage said the FBI was attempting to disarm one of the devices when it exploded. It warned that other explosions were expected.
There were no immediate reports of any injuries or damage.
The incident came after 29 people were injured in an explosion in Chelsea, Manhattan, on Saturday. An unexploded pressure-cooker device was also found four blocks away and was being analyzed by the FBI.