PARIS (AFP, REUTERS) - A London-bound British Airways flight was evacuated at Paris's Charles de Gaulle airport on Sunday (Sept 17) due to a bomb scare, but was later cleared for take-off.

A woman in her 50s has been taken into custody on suspicion of claiming that the Heathrow-bound plane, with 130 passengers on board, was going to explode, a source close to the inquiry said.

She had been refused access to the plane because she did not have a valid ticket.

An airport source said the threat was made about 10 minutes before flight BA303 was due to take off, prompting the evacuation.

Bomb disposal experts and sniffer dogs swept the aircraft, while passengers had to pass back through security, the source said. No threats were found and police later lifted the alert.

Passenger James Anderson, a 20-year-old entrepreneur, wrote on Twitter that everyone onboard had been "individually searched by armed officers", while police and fire vehicles surrounded the plane.

#BREAKING: British Airways flight held at Paris airport, surrounded by police and fire vehicles, because of a security threat (PICS: @jsa) pic.twitter.com/dN2hDD1FYA — Amichai Stein (@AmichaiStein1) September 17, 2017

The airport's operator Aeroports de Paris said an incident "linked to security" had grounded the plane.

"There was an incident that led authorities to decide to keep the plane on the ground and to disembark the passengers a few minutes before take-off, to carry out additional checks," a spokesman said.

some sort of incident involving British airways plane at Paris Charles de Gaulle airport . Lots of fire crews and police. — Jacquelin Magnay (@jacquelinmagnay) September 17, 2017

The scare came after Britain raised its terror threat level to "critical" following the bombing of a London Underground train on Friday that left 30 people injured.

The flight was able to take off shortly before noon (6pm Singapore time), more than four hours late.

British Airways said in a statement: "The safety and security of our customers and crew is always our top priority.

"We would never operate a flight unless it is safe to do so."