"Mrs Nguyen Thi Lop, 56, the widow of Nguyen Van Lem, murdered by General Nguyen Ngoc Loan during the Tet Offensive in Ho Chi Minh City.

"He was captured whilst attacking the Naval headquarters in the city. Loan died in the US in 1988."

The execution by Gen Loan was captured by photographer Eddie Adams and was one of the defining moments of the Vietnam war.