TEHRAN, June 2 (Xinhua) -- Iran's former Supreme Leader Ali Khamenei, killed in a U.S.-Israeli attack on Feb. 28, will be buried in the northeastern city of Mashhad, a senior municipal official said here Tuesday. Mohammad-Amin Tavakkolizadeh, Tehran mayor's deputy for social and cultural affairs, said Khamenei will be buried at the holy shrine of Imam Reza in accordance with his will and family's recommendation,