The Gulf of Tonkin incident (Vietnamese: Sự kiện Vịnh Bắc Bộ) was an international confrontation that led to the United States engaging more directly in the Vietnam War. It involved both a proven confrontation on August 2, 1964, carried out by North Vietnamese forces in response to covert operations in the coastal region of the gulf, and a second, claimed confrontation on August 4, 1964, between ships of North Vietnam and the United States in the waters of the Gulf of Tonkin. Originally American claims blamed North Vietnam for both attacks. Later investigation revealed that the second attack never happened; the American claim is that it was based mostly on erroneously interpreted communications intercepts.