Officials are investigating after a medical helicopter crashed on a Sacramento freeway Monday evening.

The Sacramento Fire Department said the helicopter went down on eastbound Highway 50 near 59th Street. Eastbound Highway 50 is under a full closure at 59th Street due to the crash, the California Highway Patrol said.

Officials said the aircraft is a REACH helicopter that provides air medical services. It was not yet clear how many people were on board or if the aircraft was traveling to or from an area hospital.

At least three people have critical injuries, Sacramento Fire said. The cause of the crash remains under investigation. The Sacramento County Sheriff's Office said it is assisting the CHP.

A photo taken by a CBS Sacramento crew at the scene shows the helicopter upside down acr

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