Goa, Aug. 14 -- At least seven people were killed and several others injured after a sudden rush of water and debris entered a tunnel at a project site in Uttarakhand's Chamoli district on Thursday, officials said.

Three workers are still believed to be trapped inside the tunnel, while rescue teams are continuing efforts to reach them, according to the State Disaster Management Authority. So far, 18 workers have been rescued from the site.

Around 28 people were reportedly working at the Tehri Hydro Development Corporation Ltd (THDC) project site in Pipalkoti when the sudden flow of water entered the tunnel. The powerful current swept several workers towards the tunnel's exit, reports said.

The incident triggered an immediate rescue ope...