Four Greek army officers were killed on Wednesday when their helicopter crashed in a hilly area in the centre of the country, military authorities said.

The dead include a major general, a colonel, a major and a lieutanant, the military high command said in a statement.

The Huey UH-1H helicopter had left early Wednesday from Larissa, in the centre of the country, heading north toward Kozani, army spokesman Colonel Nikolaos Fanios earlier told AFP.

State television ERT said the helicopter likely hit power cables.

Multi-purpose helicopters, Hueys are among the oldest aircraft in Greece's arsenal. The model first saw action with the US armed forces during the Vietnam War in the 1960s.

However, the high command on Wednesday said that the helicopter that crashed was fully operational.

Three Greek soldiers died last year when their Agusta Bell navy helicopter crashed into a small Aegean Sea islet during a pre-dawn exercise.