A listening device was found in Boris Johnson's private bathroom at the Foreign Office after being used by Benjamin Netanyahu, the former British prime minister has claimed.
Johnson has claimed that when the Israeli prime minister visited his department in 2017, his security team found eavesdropping devices in the toilets after Netanyahu entered.
During their meeting in his old office, Johnson says Netanyahu, whom he calls Bibi, excused himself to go to the bathroom, which Johnson describes as similar to a bathroom in an upscale London club behind a secret partition.
In his book, Unleashed, Johnson writes: "There Bibi repaired it for a while, and it may or may not be a coincidence, but I'm told that later, when they were doing a regular check for defects, they found equipment listening".
When asked in an interview with The Telegraph if he could give more details on what happened, Johnson said: "I think everything you need to know about that episode is in the book."
It is not clear whether Israel was questioned or reprimanded over the incident.
Around the same time, Israel was accused of placing listening devices in the White House.
According to US officials, Washington concluded that Israel was likely behind the deployment of cellphone surveillance devices that were found near the White House and other sensitive locations around the capital.
Although he never worked for the Mossad, Israel's spy agency, Netanyahu is known to have worked closely with them.
As the second largest spy agency in the Western world after the CIA, it focuses on foreign intelligence gathering and covert operations.