An American Airlines plane caught fire while sitting at a gate at Denver International Airport on Thursday, prompting slides to be deployed so passengers could evacuate quickly.

The plane, a Boeing 737-800, landed safely around 5:15 p.m. local time after the crew reported engine vibrations, the Federal Aviation Administration said in a statement.NBC reported.

While taxiing to the gate, an engine on the Boeing 737-800 caught fire, the FAA added.

Twelve people were transported to the hospital with minor injuries, a Denver airport spokesperson said.