CLINTON, Md. (WJZ)—Emergency crews are investigating in Prince George’s County after a tram ride carrying 30 people overturns.

The incident happened at Cosca Regional Park located in the 11000 of Thrift Road on Sunday.

Fire officials say the situation has been declared a mass casualty incident leaving 20 of the 30 people injured at this time.

Authorities say both kids and adults were on the tram ride at the time of the accident.