Normal flight operations were disrupted at Manipur's Imphal International Airport on Sunday after an unidentified flying object was spotted.
Two flights were diverted and three others were delayed.
According to officials, the services normalised after around three hours in the afternoon.
"Due to sighting of an unidentified flying object within Imphal controlled airspace, two flights have been diverted and three departing flights have been delayed. Flight operations commence after receipt of clearance from the competent authority," a statement issued by Airport Director Chipemmi Keishing said.
Over 800 passengers were affected due to the flight delays.
A message from CISF was received at around 2:30 pm to the Air Traffic Control (ATC) informing them that a UFO was found near the airport. "The UFO was visible with bare eyes moving westwards of the airfield till 4 pm," the official was quoted by PTI.
The diverted flights included an Indigo flight from Kolkata which was initially instructed "to hold overhead" and was diverted to Guwahati after 25 minutes.
The Indian Air Force Eastern Command at Shillong was informed of the development, the official said.
Manipur was recently rocked by ethnic clashes between the Kuki and Meitei communities. Amid tensions, many were using drones. Reportedly, the Centre is looking into the incident.
