A Glasgow woman has described how "mass panic" took over a British Airways flight after David Cameron's bodyguard reportedly left his gun in an aeroplane toilet. 

An investigation is underway after the incident, in which the former Prime Minister's bodyguard is thought to have left a 9mm Glock 17 pistol in the toilet on BA flight from New York to London.

Robyn Carlisle from Glasgow, who was on the flight on Monday, told how things "went a bit crazy" as fears circulated around the cabin.

She told Radio Clyde 2: "We were sitting in economy plus, and the guy who found the gun came out of the toilet.

"The cabin crew tried to calm him down but he was shouting and he tried to bring the gun out.

"At that point it just went a bit crazy."

Glasgow Times: The incident took place on a British Airways flightThe incident took place on a British Airways flight

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Robyn told the radio station that at first the cabin crew believed the man who found the gun was the one who brought it on board. 

She added: "From there, it just went a bit crazy because everyone was panicking that there was a gun on board.

"No-one knew who this gun belonged to.

"Everyone was in mass panic because we didn’t really know what was going on, even though this guy was saying it was David Cameron’s security guard."

It was only when Mr Cameron's security presented himself did the situation become more clear. 

Robyn, who missed her connecting flight to Glasgow because of the delays in departing New York, says the captain then came down to the cabin to explain the situation, adding that they tried to "downplay" the incident. 

She said: "The captain tried to explain that it is a normal situation and there are armed officers on flights and we managed to get away a couple of hours later - but as you can imagine it was a tense flight the whole way back.

"I’m a nervous flyer so as soon as a gun was mentioned it was complete panic.

"I found myself getting upset but the BA cabin crew were amazing and didn’t add to the panic."

Glasgow Times: It's understood the gun belonged to David Cameron's bodyguardIt's understood the gun belonged to David Cameron's bodyguard

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Passports belonging to Mr Cameron and the officer were also found alongside the weapon, according to the Sun.

In a statement, the Metropolitan Police said: “We are aware of the incident on a flight into the UK on February 3 and the officer involved has since been removed from operational duties.

“We are taking this matter extremely seriously and an internal investigation is taking place.”

Mr Cameron, as a former prime minister, is entitled to continued security provided by the Met’s Specialist Protection unit.

A BA spokeswoman said: “We follow CAA rules which allow UK police to carry firearms on board in specific, controlled circumstances.

“Our crew dealt with the issue quickly before departure and the flight continued as normal.”