Sources have said that the passenger made the claim while others were entering the flight. As soon as the information was spread, CISF personnel swung into action and deboarded everyone from the flight.
The CISF officials thoroughly checked the aircraft. However, no bomb was found on the flight. As a precautionary measure, the authorities have decided to cancel the flight tonight (Thursday night).
Patna police also come into action and immediately sent multiple teams of bomb and dog squads. They were searching the entire airport premises till the time of reporting.
Reacting on it, an official said: "We have not found any bomb or suspicious article from the plane or anywhere else from the airport premises so far. The search operation is currently underway in and outside the airport. Bomb and dog squad were also present at the search operation."
Officials said passengers on board the two aircraft-- Royal Nepal Airlines (Delhi-Kathmandu) and Air India (Delhi-Bhubaneswar-- were evacuated and taken to the isolation bay where security agencies carried out anti-sabotage checks after a threat call was received by the airport control room at about 10 AM.
While the Kathmandu flight (RA-206) had 155 passengers and nine crew members, the flight bound for Odisha's capital Bhubaneswar (AI-075) had 178 fliers and seven crew members.
Passengers of both the flights and their baggage were subjected to a second round of checking with the Bomb Threat Assessment Committee (BTAC) at the IGIA monitoring the situation.
Security personnel from the CISF and Delhi Police cordoned off the two planes along with bomb disposal squads, the officials said.
They added the threat was triggered after the airport control room received a call from a person identifying himself as Abhishek Singh, a "CBI officer" and said that while there is a "time bomb" in the Nepal bound flight, some "movement" has happned at the terminal area to hit the AI flight.
Officials said the agencies are trying to track the number and location from where the call was made to the airport call centre.
Anti-sabotage checks are on at the two aircrafts, they said.
Preliminary reports said four Members of Parliament were to travel on the AI flight.
Talking to OTV over phone, Parida said he was told over phone by airport authorities not to board the plane. "Some people who had already boarded were immediately evacuated," he said.
About the menace of hoax calls, Central Industrial Security Force chief Surender Singh had said while 44 such calls were received last year at various airports the force is deployed, 16 such calls have been made till early March this year.
There was no confirmation on whether there was any device in the vehicle, but security at the White House was immediately upgraded on Saturday night.
The vehicle is being checked, the officials said.
The incident occurred at 11.05 p.m., according to the Secret Service.
President Donald Trump is not at the White House. He is at his Mar-a-Lago estate in Florida.
Several streets around the White House remained closed early Sunday in what the Secret Service described as an "on-going criminal investigation", reports CNN.
Earlier on Saturday, another person was arrested after jumping over a bicycle rack in front of the White House.
The man, who never made it to the White House fence, was carrying a document he wanted to deliver and did not have a weapon, a law enforcement official said.
The incidents come a week after a man breached the White House grounds -- and was on the grounds for more than 15 minutes.