Israel and the US have alleged also that Arafat was involved in the 1973 Khartoum diplomatic assassinations, in which five diplomats and five others were killed. A 1973 United States Department of State document, declassified in 2006, concluded "The Khartoum operation was planned and carried out with the full knowledge and personal approval of Yasser Arafat." Arafat denied any involvement in the operation and insisted it was carried out independently by the Black September Organization. Israel claimed that Arafat was in ultimate control over these organizations and therefore had not abandoned terrorism.