Military officials in Greece said four army officers have been killed and one has been injured in the crash of a border patrol helicopter in northern Greece, ABC News reported.

The accident occurred Wednesday, north of the town of Elassona, some 450 kilometers (280 miles) northwest of Athens.

Army officials say the Huey UH-1H helicopter had been on a routine border patrol flight.

A Greek military official confirmed the deaths but insisted on anonymity pending an official announcement.

An extensive search of the rugged area was launched after the army lost contact with the helicopter, which had taken off from the central city of Larissa.

Source: MENA