A US Coast Guard plane collided Thursday with a military helicopter off the southern California coast, the Associated Press quoted a Coast Guard spokesman as saying.

There has been no immediate report of casualties so far.

The navy reported crash of a helicopter at about 7:00 p.m. local time Thursday (2200 GMT). The helicopter went down about 24 km east of San Clemente Island, the southern tip of the Channel Islands.

The Coast Guard said several vessels were searching the area for the wreckage.