MONROE, Ohio (WKRC) – Fire crews put out a fire at an Amazon fulfillment center in Monroe.

Crews were called to the facility on Gateway Boulevard just before midnight Sunday.

The department said the sprinkler system kept the fire contained until firefighters could put it out.

Investigators determined the fire started within the pallet racking storage system although they don’t know yet how it started.

No one was hurt. No word yet how much damage the fire did.