The third person's condition wasn't immediately known. Peters said divers were still searching early Sunday evening to see whether anyone else was aboard.
A skydiving instructor at Mohawk Valley Airport told the Times Union of Albany he and others who were in the small airstrip's restaurant heard the crash, ran down the airstrip and jumped into the river to help a fisherman drop an anchor to help rescuers find the downed plane.
"There's nothing we wanted to do more than get into that plane," said Michael McGuire.
The aircraft was registered to Kolath Airlines Inc. of Bear, Del., Peters said. A woman who identified herself as Kolath's registered agent said she didn't know about the crash and had been unable to contact anyone with the company.
It wasn't immediately clear whether Kolath is a commercial venture or a corporate name for an owner's personal aircraft.
The telephone rang unanswered Sunday evening at the airport. State police, who were leading the emergency response, had no immediate information.
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