sentence1: The Guardian is reporting that the University is being used by young men and women to stock up on firebombs and break up marble slabs to throw at police. From behind their makeshift barriers, they vowed the unrest would become "an uprising the likes of which Greece has never seen." "We are experiencing moments of a great social revolution," leftist activist Panagiotis Sotiris told Reuters. Sotiris is among those occupying a university building. "The protests will last as long as necessary," he added.
sentence2: The riots in Greece started on December 6.