Amtrak searching for several suspects after 7 cars stolen from garage near 30th Street Station

PHILADELPHIA (WPVI) -- An investigation is underway after multiple cars were stolen from a garage in Philadelphia on Sunday.

It happened at the Cira Center on the 2900 block of Arch Street near 30th Street Station in the University City neighborhood.

Action News learned that several thieves broke into a lock box where the car keys were stored and got away with at least seven vehicles, mostly Audis.

We also learned that the garage houses rental cars, which all have trackers in them.

So far, Philadelphia police have recovered three white Audi SUVs in the city's Summerdale section.

Action News was there along the 900 block of Sanger Street when police located one of the vehicles Sunday night.

They also located two other vehicles in a nearby alley off of Trotter Street.

The cars are delivered by a third-party company called Kyte, which delivers and picks up rental cars for customers. Whoever stole the vehicles appeared to know quite a bit about the process of how the vehicles were stored in the garage.

Some people who park their cars here say they are surprised.

"I've thought about the possibility of, like my car may not be here when I get back, and that would be worrisome," said Giann Gorospe of New Jersey.

There is no word yet on any possible suspects in this case.

Anyone with information is urged to call police.

RELATED: Check the 6abc Neighborhood Safety Tracker