The call was later declared as "non-specific" by the Bomb Threat Assessment Committee (BTAC), airport sources said. Flight operations during this period were unaffected, they said.
"At around 2.30 AM the call centre of the Indira Gandhi International Airport received an anonymous call saying that someone from Amritsar present at the airport was a terrorist.
The information was immediately passed on to the airport authorities as well as all the aviation security agencies," the sources said.
The BTAC was formed to assess the threat, they said, adding, security agencies carried out an extensive screening of the people at the airport.
The BTAC declared the call as "non-specific" at around 3.30 AM, the sources said.