ATHENS, Greece - Officials today said they had found only the exterior container of the cockpit voice recorder from a Cypriot airliner crash that killed 121 people, hampering investigative efforts into the accident's cause.

Autopsies on the bodies of 20 people on board, including one flight attendant, show they were alive when the plane went down, an Athens coroner said Tuesday.

Nikos Kalogrias, one of a team of seven coroners, said the 20 victims' hearts and lungs were functioning when the plane crashed. "The attendant was alive and died of injuries" sustained in the crash, he said.

Private Greek television channel Mega reported that an autopsy on the co-pilot showed he was also alive at impact. Pilots of two Greek F-16 fighter jets had reported seeing the co-pilot slumped over the cockpit controls, apparently unconscious, shortly before the crash.

The voice recorder's internal components were ejected from the container when the plane crashed into a mountainous region north of Athens on Sunday, said Akrivos Tsolakis, the head of the Greek airline safety committee.

He said a group of investigators would search for the rest of the voice recorder. He said American experts, including a representative of the plane's manufacturer, were providing assistance.

The voice recorder picks up any conversation inside the cockpit but records only the last 30 minutes of sound. Because the airplane appeared to have been flying disabled for several hours, it wasn't clear how useful any recovered conversations would be for investigators.

The Helios Airways Boeing 737-300, with six crew and 115 passengers, plunged 34,000 feet into a mountainous area near the village of Grammatiko, 25 miles north of Athens. It had taken off in Cyprus and was heading for Prague, Czech Republic.

In Cyprus, police raided the offices of Helios Airways in the coastal city of Larnaca, near the international airport.

A search warrant was issued "to secure ... documents and other evidence which could be useful for the investigation into possible criminal acts," Cyprus' deputy presidential spokesman Marios Karoyian said.

Investigators also were trying to determine why the pilot was not in his seat shortly before the crash.

The plane might have run out of fuel after flying for nearly three hours on autopilot, air force officials said, asking not to be named in line with Greek practice.

A Cypriot transport official had said Sunday the passengers and crew may have been dead before the plane crashed due to high altitude decompression..

Searchers were still looking for three bodies, including the plane's German pilot, fire officials said.

The airliner's pilots had reported air conditioning system problems about a half-hour after takeoff, and Greek state TV quoted Cyprus' transport minister as saying the plane had decompression problems in the past.

But a Helios representative said the plane had "no problems and was serviced just last week."

A man who claimed to have received a telephone text message from a passenger on the plane faced a preliminary hearing Tuesday for disseminating false information and causing a public disturbance.

Police on Monday arrested Nektarios-Sotirios Voutas, 32, who had called Greek television stations shortly after the crash. He claimed a cousin on board had sent him a cell-phone text message saying: "Farewell, cousin, here we're frozen."

The report that the plane was cold was taken as a sign of decompression - one of the possible explanations authorities have given for the crash. But police said they determined the suspect's story was false.