A view shows debris and blood after mortar bombs landed on the canteen of Damascus University's College of ArchitectureBy way of Oliver Holmes and Hamdi Istanbullu BEIRUT/ISTANBUL (Reuters) – Fifteen Syrian students were killed when rebellion mortar shells hit a Damascus University canteen on Thursday, state-run news company SANA said, as attacks intensified within the middle of the capital. The Syrian Observatory for Human Rights, an opposition monitoring staff, said a mortar killed thirteen individuals at the university, with out saying who fired the bombs. Different activists validated the attack however no opposition crew has denied or claimed responsibility. …