By Geoff Herbert

A “serious” crash at Heathrow Airport has left one worker dead and caused delays for hundreds of passengers.

The Telegraph reports two vehicles collided on the airfield early Wednesday morning at the London international airport’s Terminal 5. Emergency teams rushed to the scene to treat two seriously injured workers.

Officials said one of the workers, a man in his 40s, died at a West London hospital. He is not being identified until family is notified.

The other worker sustained a broken shoulder, but Scotland Yard said his injuries are not believed to be life-threatening.

“Our deepest condolences go to the family and friends affected by this accident. We will be fully cooperating with the police in the investigation which will follow,” a Heathrow spokesperson told the BBC.

The BBC reports passengers on one plane were forced to evacuate after the crash. Another 20 British Airways flights were delayed, affecting hundreds of travelers.

“The gate was surrounded by various airport service vehicles including two fire engines. There were blue lights everywhere,” one passenger wrote on social media.

Additional details have not been released, though a spokesperson said The Health and Safety Executive has been informed and officers from the Met’s Serious Collision Investigation Unit are investigating.

The airfield remains open. Heathrow Airport representatives said additional delays are not expected.