Tamil Tiger rebels have carried out a possible suicide attack and bombed Sri Lanka's main tax office in the capital Colombo.
At least two people were killed and 44 injured, according to a doctor at the main hospital where the wounded were taken, after one of the aircraft hit the building and detonated a bomb.
Sri Lanka's air force said anti aircraft guns shot down one of the light aircraft as it was trying to get away after flying over the capital, while the wreckage of the second was found inside the Inland Revenue building.
The country's only international airport was shut down briefly and flights were diverted to neighbouring India.
Airforce spokesman Janaka Nanayakkara said gunners had brought down one of the light aircraft near the international airport where the military maintains its main air bases.
