The emergency status was withdrawn at around 12.10 pm, according to airport sources who declined to confirm whether the threat was a hoax

Police officers from the Valiyathura police station arrived at the airport to investigate the incident

Earlier in the morning, the pilot of the aircraft informed the ATC about the threat after a 'Bomb in flight' message, written on a tissue paper, was found in the washroom of the plane, the sources told PTI

The bomb threat was communicated by the pilot at 7.30 am as the aircraft approached the Thiruvananthapuram airport, the sources told PTI

Subsequently, a full emergency was declared at the airport at 7.36 am, they said