George Habash
While the identities or even number of the men involved is unknown they are said to have been members of the Popular Front for the Liberation of Palestine, a secular left-wing Marxist-Leninist revolutionary socialist group founded by George Habash in 1967. They were previously known for plane hijackings such as the TWA Flight 840 hijacking in 1969. They were known to be allies of the Japanese Red Army and many other far-left terrorist groups and are still active to this day.