On June 8, 1967, Israeli war planes and torpedo boats attacked a US electronics intelligence ship monitoring the Six Day War that was underway. The casualty toll was 34 Americans killed, and 136 wounded in what became known as the USS Liberty incident. The reason for the attacks remains the subject of controversy: most say it was an accident; some see a CIA plot. The Washington accepted an indemnity and an official apology from Israel for the attack.