Two workers at the Ultra Music Festival in Florida were seriously injured on Thursday (14Mar13) when an enormous Tv screen fell onto them as they helped to set up the event.

The two festival staff were trapped under the heavy Led monitor when it collapsed, and they were rushed to hospital in a critical condition after firefighters freed them from the debris.

Two others suffered minor injuries in the incident but did not require hospital treatment.

The 30-feet (nine-metre) long Led screen was suspended over a stage at the south end of the festival venue - Bayfront Park in Miami - and is believed to have toppled to the ground as workers prepared to complete construction of the platform. Work on the stage was suspended until Friday (15Mar13).

Miami Fire-Rescue spokesman Lt. Ignatius Carroll says the two seriously injured victims were taken to Jackson Memorial Hospital's Ryder Trauma Center, where they were in a critical condition as Wenn went to press.

Structural engineers, representatives from the Occupational Safety and Health Administration, and fire marshall staff will visit the site on Friday to inspect all the stages to make sure there is no danger to the public.

In a statement, the event organisers said, "Today (Thursday, March 14) as preparations were being made for this weekend's Ultra Music Festival, a section of an Led screen fell and injured two workers. Fire Rescue was on site so there was a rapid response. Festival organizers are working with, and supporting, authorities as they investigate the details behind the accident."

The event, featuring acts including David Guetta, Deadmau5, and Crystal Castles, is due to kick off on Friday.