A builder working on a construction site horrified star guests at a London Fashion Week show on Tuesday (16Sep14) when he plunged through a glass roof.

The accident happened during a Fashion East event at a Topshop Show Space in the city, and attendees including former MTV presenter Alexa Chung and pop star Pixie Lott were left shocked by the incident.

Eyewitnesses report the victim toppled through a corrugated plastic roof panel and bounced off a large metal pipe before plummeting 50 feet (15.3 metres) and landing on his back.

Paramedics were called and the man, who has not been named, was treated at the scene before being taken to hospital.

A witness tells Britain's Daily Telegraph, "At first there was confusion, we thought it was a light falling over. Then security men started running backstage and there was loud shouting. The weird thing was that the show just carried on. The whole audience was totally bewildered."

A spokesman tells Vogue, "The way that the Topshop space is built, the walls that separate the catwalk and audience space from backstage don't go all the way to the ceiling, so people could see that something had happened, but it did not in any way endanger the audience. It didn't happen above people's heads and there was no one in the space where he fell."