Supreme leader Khamenei orders investigation into claims of vote rigging after presidential elections; clashes between protesters and security forces in cities of Tehran, Mashad, Tabriz and Shiraz; Tehran: According to unconfirmed reports, 3 killed and 15 wounded as police raids dormitory and 2 killed in Shahrak Gharb suburb; Opposition candidate Musavi cancels gathering after being warned that security forces will be equipped with live ammunition