A helicopter has crashed at the Fort Hood military base in Texas, killing all four crew members on board.

A helicopter has crashed at the Fort Hood military base in Texas, killing all four crew members on board, US media reported Tuesday.

The accident happened after 5:49 pm (2349 GMT) Monday and emergency crews carried out an exhaustive search before locating the wreckage, NBC news reported, citing the US Army.

The UH-60 helicopter was carrying members on a routine training mission and a board will investigate the crash, US media reported.

Fort Hood is located around 200 miles (320 kilometers) northwest of Houston.