Federal investigators say the pilot of a plane that crashed on a Morris County  highway, killing five, reported picking up some ice.

But National Transportation Safety Board investigator Ralph Hicks said at a Wednesday news conference that it might never be known how much ice accumulated on the single-engine aircraft. He says the pilot didn't relay that information.

The plane spiraled out of control, broke apart and crashed on Interstate 287 in Morris Township on Tuesday morning. Investigators said Tuesday that the pilot had discussed icing with the controller but that they didn't yet know whether his plane had experienced icing.

Hicks says the plane was equipped with a deicing system.

Killed were two investment bankers heading for Georgia, a wife of one of them, and two children.

(Copyright 2011 by The Associated Press.  All Rights Reserved.)

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