Assassination attempts on U.S. President Harry S. Truman occurred on November 1, 1950. It was carried out by militant Puerto Rican pro-independence activists Oscar Collazo and Griselio Torresola while President Truman resided at Blair House during the renovation of the White House. Both men were stopped before gaining entry to the house. Torresola mortally wounded White House Police officer Leslie Coffelt, who killed him in return fire. Secret Service agents wounded Collazo. President Harry S. Truman was upstairs in the house and not harmed.