The Union of Peoples of Northern Angola(UPA) killed Africans who remained loyal to their white Portuguese employers on March 15, 1961, in Portuguese Angola due to the Angolan War of Independence in Africa.

     The Angolan War of Independence in Africa led to the murder in Portuguese Angola of Africans who remained loyal to their white Portuguese employers by the Angolan People's Alliance (UPA) on March 15, 1961, during the first months of the Angolan War from March 15 to July 8, 1961, The massacre was perpetrated by a brutal terrorist attack perpetrated by the UPA of Holden Roberto's armed forces.

 　The colonial war in Angola was exposed with the publication by Horácio Caio in "Angola, Days of Despair (October 1961)", with brutal pictures of the massacres committed by the UPA against the civilian population of whites, blacks, women, children, elderly and defenseless people. Pictures were published of the many corpses of the victims of what became a blind and unchecked terrorist attack unleashed in the name of liberation. The Angolan War of Independence led to the outbreak of the colonial war from February 4, 1961 to April 25, 1974.

　On March 15, 1961, the Angolan People's Alliance (UPA) under Holden led an armed force of about 4,000 to 5,000 Angolans from their base in Zaire to invade northern Angola. Angolan People's Alliance troops took and occupied agricultural lands, government outposts, trading centers and colonial settlements, and commercial areas. They killed civilian civilians and government officials. Most of the victims were Ovimbundo contract laborers from the Central Highlands.UPA militants raided the Angolan districts of Zaire Province, Uige, Quanza Norte, and Luanda, slaughtering civilians during the invasion, 1,000 whites and 6,000 blacks (women and children were among them) murdered. They also included European whites and African black women and children. In addition to the carnage, UPA militants destroyed homes, farms, roads, bridges, and other infrastructure, causing general chaos and panic. Terrified residents took refuge in the forests or fled to neighboring areas and Congo-Leopoldville.

 　On February 4, 1961, the starting point of the Angolan War of Independence, about 50 members of the Popular Movement for the Liberation of Angola attacked a police station and St. Paul's prison in Luanda, Angola, killing about 40 attackers and seven Portuguese police officers. at the funeral of a Portuguese police officer on February 5. The revenge was terrible. The police helped massacre civilians in the slums of Luanda at night. The whites dragged the Africans from their fragile homes and left their bodies in the streets after shooting about 300 of them, the first starting point of a war that UPA would decimate the entire northern part of Angola on March 15.