(KOB) The FBI is working to determine who put a bomb on a rental car returned to Avis Budget Rental at the Albuquerque International Sunport.

Law enforcement swarmed the airport’s rental car complex after an employee spotted the device Sunday morning.

Albuquerque police confirm a rental car mechanic made the terrifying discovery of an explosive device fixed to the bottom of a rental car return Sunday morning.

Avis Budget employee Susan Russell says the car was one of theirs — a recently returned Ford Edge.

“We knew right around 8:30 that they found something suspicious under one of our Avis Budget returns,” Russell said.

APD’s Bomb Squad is tasked with neutralizing the explosive as FBI and ATF agents take the lead on investigating how it got here.