"Jews" disguise as Arabs

"The main motive of the bombing was to destroy documents incriminating the Jewish Agency in attacks against the British, which were obtained during Operation Agatha, a series of raids by mandate authorities. It was the deadliest attack directed at the British during the Mandate era (1920–1948).[8][9]

Disguised as Arab workmen and as hotel waiters, members of the Irgun planted a bomb"

https://en.wikipedia.org/wiki/King_David_Hotel_bombing

King David Hotel Bombing