Transcript for Aug. 14, 2005: Helios Airways flight crashes in Greece, killing everyone on board

We begin tonight west of here in Greece. Where a jetliner has crashed near Athens killing all 121. People onboard including 48 children. Greek officials are calling at their worst airline disaster in history. And they say a lack of oxygen on the plane may have played a role in the crash ABC's Hilary brown has details. The Boeing 737. Plunged into a hillside 25 miles northeast of Athens just after noon local time. Helicopters circled overhead all afternoon dumping water over the burning wreckage to stop brush fires. The plane was flying from Cyprus to Athens officials say there had been no radio contact with the aircraft before the crash. That is no communication between the accomplice tentative and then. A couple of things items and bring things. Greek officials believe that this was not an act of terror. When Greece scrambled two F sixteens to intercept the passenger plane. The fighter pilots said they saw a no pilot in the cockpit only the co pilot unconscious and two people trying to take over the controls. Oxygen masks were dangling in the passenger cabin. They were that I am the other contacted the Indy themed. Because. Those without any medium without including the pilot were moved them. Aviation officials in Cyprus released a statement saying that the pilots appeared to have passed out because of a loss of cabin pressure. That would lead to extreme cold and the loss of oxygen. One of the passengers reportedly sent a text message to a relative saying. Cousin farewell. We are freezing. According to the airline he list their Boeing 737 was serviced last week. But the Cyprus Transport Minister told Greek television that the plane had suffered decompression problems in the past. Within hours of the crash and relatives of the passengers rushed to the Cyprus airport hoping for news of survivors. But there are no survivors. Grief stricken they accuse the airline manages American. After a day of searching and rescue teams recovered the plane's two black boxes. Which may hold more clues to the worst air disaster ever seen in greets. Hilary brown ABC news London.

This transcript has been automatically generated and may not be 100% accurate.