A United Airlines flight has returned to San Diego International Airport after a small fire that sent four people to the hospital, California firefighters said.

Boeing 737 landed back at the airport around 7:30 a.m. Tuesday, Feb. 7, after a laptop caught fire, the Federal Aviation Administration told CBS News.

The San Diego Fire Department assisted evacuate passengers and crew from the jet, firefighters said on Twitter. Four people were taken to the hospital.

Firefighters reported that an external battery caught fire in the cabin. The flight crew prevented the fire from spreading.

“Ours The crew acted quickly to retain the device and medical personnel met the aircraft upon arrival at the gate,” United Airlines said in a statement to KFMB. “We thank our crew for their quick actions in prioritizing the safety of everyone on board the aircraft, and we are taking steps to get our customers to their destination.”

FlightAware reported that the plane was in the air for about 44 minutes, according to the station.

Several ambulances and rescue vehicles met the plane, United Flight 2664 to Newark Liberty International Airport, at the gate, according to KNSD.