A portion of a tent being erected for yoga guru Ramdev's protest at the Ramlila Maidan in New Delhi collapsed on Tuesday morning due to rains, leaving four labourers injured.
Organisers said the tent collapsed due to rain.
The labourers suffered minor injuries, they said.
Ramdev is scheduled to sit on an indefinite protest from August 9 demanding that black money stashed away abroad should be brought back to the country.
Team Anna attacks Ramdev, calls Modi murderer of humanity
This time it's do or die: Arvind Kejriwal
The pill pushers: Story of a questionable nexus
Anna Hazare warns govt on Lokpal Bill issue
Anna Hazare joins fast ignoring appeal from close aides