On July 7, 1963, the secret police of Ngô Đình Nhu—the brother of President Ngô Đình Diệm—attacked a group of journalists from the United States who were covering Buddhist protests on the ninth anniversary of Diem's rise to power. Peter Arnett of the Associated Press (AP) was punched in the nose, but the quarrel quickly ended after David Halberstam of The New York Times, being much taller than Nhu's men, counterattacked and caused the secret police to retreat. Arnett and his colleague, the Pulitzer Prize-winning journalist and photographer Malcolm Browne, were later accosted by police at their office and taken away for questioning on suspicion of attacking police officers.[26][27][28]