Explosive devices, including two pipe bombs, were discovered recently inside a self-storage unit in Valle, Ariz., near Flagstaff. Investigators uncovered the pipe bombs, along with improvised explosive devices (IEDs), shotgun shells with a fuse attached to the primer, and other items, after a man cleaning out the unit reported finding a number of IEDs, according to the source.

One of the pipe bombs detonated while technicians from the Flagstaff Police Department’s Explosive Device Response Team were examining the devices, but no one was injured, the source reported.

It’s unclear why the man who discovered the explosives was asked to clean out the unit. Investigators believe the man responsible for the devices is currently serving a 10-year prison sentence in New York. Police withheld the suspect’s name pending further investigation but indicated he is incarcerated for charges stemming from unlawful possession of explosive devices and firearms in an unrelated incident.

No charges have been filed in the case.

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