An IndiGo flight operating from Kuwait to Delhi was diverted to Sardar Vallabhbhai Patel International Airport in Ahmedabad on Friday morning after a bomb threat was reported on board, officials at the airport said.Nothing suspicious has been found yet, they said.The aircraft landed safely around 6.40 am with 180 passengers on board, an airport official said.According to the airport authorities, the flight was diverted to Ahmedabad as a precautionary measure after a passenger found a handwritten note on a piece of paper claiming the presence of a bomb on the aircraft.After being informed about the threat, the pilot alerted the air traffic control and the aircraft was diverted to Ahmedabad.All passengers were safely evacuated upon landing. Security personnel and airport staff then carried out a thorough search of the aircraft.”So far, no suspicious object has been recovered. The flight may take off after getting a final go-ahead,” an airport official said.