A suspected LTTE aircraft had been sighted over the Kokavil area and North of Trincomalee on Friday evening, defence sources said.
The radar of a Navy Dvora patrolling the Kokavil sea had detected the unidentified craft and informed the Air Force, a military source said. The object had proceeded from the sea towards land and disappeared from the radar monitor, a senior naval official said.
He said the aircraft had flown towards the northern coastal area in Trincomalee and then towards LTTE held Pulmudai`.
However, the Air Force said it had not detected any such movements, but was on alert to meet any eventuality.
Navy official said the flight may have been a Tiger training exercise.