BIG BEND, Wis. (AP) _ A television news helicopter with only the pilot aboard crashed Wednesday during rush-hour on an expressway southwest of Milwaukee.

The 45-year-old pilot was taken to a hospital with severe injuries, said Lt. Karen Ruff of the Waukesha County Sheriff's Department.

Four vehicles were involved in an accident trying to avoid the helicopter from Milwaukee TV station WISN when it went down on Interstate 43, Ruff said. Some of those in the vehicles suffered minor injuries.

The pilot had been covering a fire in Milwaukee, Ruff said. She said there was light rain and poor visibility at the time of the crash.

The cause of the crash was being investigated.