g taken to the Erie County medical exam

Speculation has focused on the wintry weather as the cause of Thursday night's crash, when the Dash 8 Q400 turboprop plane pitched wildly in its final approach before plunging to earth, killing all 49 people on board and one person in the house.

Two women in the house survived.

Chealander said it was too early to know whether ice was to blame. The mechanical systems seemed to be working normally, he said, but there would be more clarity when a team in Washington begins a detailed analysis of the flight recorders on Sunday.

The plane's crew reported snow and mist and commented on ice buildup on the windscreen and front of the wings shortly before the crash, according to the cockpit voice recorder.

The delicate and gruesome task of recovering remains and evidence from the site about 6 miles (10 km) from Buffalo Airport was being handled by 100 to 150 NTSB investigators, FBI agents, coroners and volunteer firefighters.

Bodies were being taken to the Erie County medical examiner for identification.

As the plane descended toward the airport with its landing gear down, its nose suddenly and violently moved up and down and its wings see-sawed, investigators said after initial reviews of the flight data and cockpit voice recorders.

Despite witness accounts that the plane nosedived into the house, Chealander said the wreckage was lying flat and the nose was pointed in the opposite direction to the runway.