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NTSB: No obvious sign of cause of CT. plane crash

Michael Melia, Associated Press

In this photo provided by the National Transportation Safety Board NTSB senior air safety investigator Bob Gretz, back to camera, confers with emergency responders on the scene of Friday Aug. 9, 2013 morning's crash of a Rockwell 960B airplane into a neighbohood in East Haven, Conn. (AP Photo/National Transportation Safety Board)

HARTFORD, Conn. (AP) -- Investigators in the Connecticut plane crash that killed four people say they've found no obvious signs there was anything wrong with the plane.

Federal safety investigator Patrick Murray said at a news conference Saturday in New Haven that he would have a preliminary report within 10 days but it would be months before a final determination is made of the cause of Friday's accident.

He said the plane landed upside down at an angle on two East Haven homes as the pilot was apparently turning to land at Tweed New Haven Airport in rainy weather.

Former Microsoft executive, Bill Henningsgaard, and his teenage son are presumed dead, along with two children in one of the homes.