An IndiGo Airlines aircraft was forced to make an emergency landing at the Lal Bahadur Shastri International Airport here on Sunday following information about a bomb on board, police said.According to Phulpur-Babatpur police, a note claiming that there was a bomb in the aircraft was found written on a piece of paper, triggering an alert.The aircraft was carrying over 200 passengers from Hyderabad to Varanasi, police said, adding that upon receiving the information, it made an emergency landing at the Babatpur airport.Security agencies, including the CISF, bomb disposal squad, fire brigade and police personnel, rushed to the spot and carried out a thorough check of passengers and the aircraft according to standard security protocol, police said.Airport officials said security agencies are conducting further investigations into the incident.