Tamil Tiger rebels are now cornered in a small area in the northeast of the island and the military has already capture seven airstrips.
Air force spokesman Janaka Nanayakkara said a body has been found in the wreckage of the aircraft in Katunayake.
An aircraft was also found at the revenue office building, a part of which caught fire.
Meanwhile a spokesman at Colombo's main hospital said at least 14 persons were admitted to hospital and one person was in a serious condition after a bomb was dropped near the main revenue office.