London: A UK official's bodyguard was suspended as he forgot his gun on plane while travelling. British media reported Saturday that the police protection officer travelling with Foreign Secretary Dominic Raab on a visit to the United States left the pistol on a plane at London's Heathrow Airport.

A cleaner found the weapons inside the plane, media reports said. 

London's Metropolitan Police said the force was aware of "the incident on a flight into the UK on Friday" and is "taking this matter extremely seriously."

"The officer involved has since been removed from operational duties whilst an internal investigation into the circumstances is taking place," the police department said on Saturday in a statement.

A similar incident occurred  in February when the bodyguard for former Prime Minister David Cameron left his gun in the bathroom on a British Airways flight. The pistol was reportedly found by a passenger, who handed it to flight attendants.

Raab visited Washington this week to speak with US Secretary of State Mike Pompeo and other officials about Brexit.