SAN DIEGO (AP) - A small plane broke apart in flight before it crashed almost two weeks ago near Miramar Marine Corps Air Station, killing two people, according to federal investigators.

A preliminary report released Monday by the National Transportation Safety Board said the single-engine Piper Comanche broke apart while making an "uncontrolled descent" and smashed into a hillside, where it caught fire.

It also said the area was cloudy at the time of the April 11 crash, but the pilot did not report any problems during flight.

The 51-year-old pilot, Friedrich Leo Weber of Burbank, and his 58-year-old wife, Mary, were killed when the plane went down about 5 1/2 miles from the base.

The plane, which flew out of Whiteman Airport in Los Angeles, was heading for Brown Field Municipal Airport in San Diego.

Copyright 2009 The Associated Press.