London’s Metropolitan Police are investigating after former Prime Minister David Cameron’s bodyguard reportedly left his gun in an airplane bathroom. The weapon found on a trans-Atlantic flight was handed to flight attendants. It was also reported that passports belonging to Cameron and the officer were found.

Police said they were aware of the matter that took place Monday and that the officer involved has since been removed from operational duties.

“We are taking this matter extremely seriously and an internal investigation is taking place,” police said in a statement.

The passenger who found the gun and passports had taken photographs on his phone and it was said he was showing the images to others on the flight.

A British Airways 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.”

As a former British prime minister, Cameron is entitled to security provided by a specialist police unit.

The UK Sun reported that the passenger who found the items was upgraded to business class.