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LONDON – At least 6 people became ill on Wednesday while on an American Airlines flight from London to Los Angeles.

According to CBS News, the flight started out normal but after about 2 hours the crew turned on the cabin lights and asked if there was a doctor on the plane.

“It was probably as tense as anyone wants to be 30,000 feet in the air,” passenger Eric Winter said.

British band ‘Race the Horizon’ was on board and said a crew member pass out.

“It was just a shock really. She was walking down the aisle, I don’t know she just like sort of literally fainted in front of me,” band member Kris Evans said.

Once several passengers and crew members said they were lightheaded, a pilot said they were feeling fine in the cockpit, but they were going to turn around and go back to London.

Winter said the crew acted very professionally the entire time.

“In the absence of information, your mind can go crazy, but I think they did a tremendous job,” he said. “They communicated to us every step of the way. And here we are. We’re sitting on the ground and we’re fine.”

A hazmat crew checked out the plane and nothing questionable was found, but the plane will be thoroughly cleaned before it is used again.