A Danish pilot and a Greek crew member died when two helicopters collided while attempting to put out a fire in Porto Germeno, a seaside village northwest of Athens on Sunday. Photo by Orestis Panagiotou/EPA

Aug. 2 (UPI) -- Two firefighting helicopters collided midair as they battled wildfires in Greece on Sunday, killing two people.

A Danish pilot and a Greek crew member died in the crash while attempting to put out a fire in Porto Germeno, a seaside village northwest of Athens, officials said.

Two other crew members were rescued alive.

"I express my deep sorrow for the tragic accident involving the two decommissioned firefighting helicopters that claimed the lives of two frontline fighters in the war against fires under very adverse weather conditions -- especially for our air forces," Greek Prime Minister Kyriakos Mitsotakis said in a statement.