Federal investigators in Quantico, Virginia, are examining evidence from Saturday’s explosions in New Jersey and New York.

According to one federal law enforcement official, devices in both explosions included cellphones, but the New Jersey device contained evidence of a black powder explosive. The official says in the New York incident, the device that exploded had residue from an explosive called Tannerite.

The official wasn’t authorized to discuss details of the ongoing investigation and spoke to The Associated Press on the condition of anonymity.

Tannerite is often used in target shooting to mark a shot with a cloud of smoke and small explosion.

New York Mayor Bill de Blasio says there’s no evidence that the two incidents are related, but a connection hasn’t been ruled out.

(AP)