Startling new evidence revealed in a BBC documentary shows that President Lyndon Johnson had no doubts that the Israeli attack on American spy ship USS Liberty, which left 34 American servicemen dead and 171 wounded, had been a deliberate attack. The incident happened ... during the Arab-Israeli Six Day War. Unmarked Israeli planes attacked and nearly sank the USS Liberty. Israel has always claimed that the affair was a tragic accident. The government of President Lyndon Johnson publicly accepted this explanation. In fact ... those at the very top never believed the Israeli version. The picture that emerges is of a daring ploy by Israel to fake an Egyptian attack on the American spy ship, and thereby provide America with a reason to officially enter the war against Egypt. Intercepts recorded during the incident reveal how America was convinced the attack was intentional, and the minutes of a White House meeting clearly suggest that President Johnson believed the attack had been deliberate. The Liberty survivors have continued to argue that the attack was intentional and that the US government colluded in a cover-up. Today, the veterans are still calling for a full investigation by Congress. It remains the only case of an attack on a US ship without a full Congressional enquiry. [The documentary] offers evidence of a secret collaboration between America and Israel before and during the war - a covert alliance of intelligence agencies that has always been denied by both sides.