Former British Prime Minister Boris Johnson said a listening device was found in his personal bathroom at the Foreign Office after being used by Israeli Prime Minister Benjamin Netanyahu.

Johnson added that when the Israeli prime minister visited his ministry in 2017, his security team found eavesdropping devices in the toilets.

Asked in an interview with The Telegraph if he could provide any further details about what happened, Johnson said: "I think everything you need to know is in my book Unleashed." It is not yet clear whether Israel has been questioned or reprimanded over the incident.

At about the same time, Israel was accused of planting eavesdropping devices in the White House.

According to US officials, Washington has concluded that Israel was likely behind the placement of cellphone surveillance devices found near the White House and other sensitive locations around the capital.

Although he never worked for Mossad, the Israeli spy agency, Netanyahu is known to have worked closely with them.

Mossad, the world's second largest spy agency, focuses on intelligence gathering and covert operations.