Published: Jun 29, 2011 12:12 PM EDT
Updated: Jun 29, 2011 11:12 AM EDT

ATHENS, Greece (AP) - Clashes have broken out between riot police and protesters outside the Greek Parliament where deputies are about to vote on a crucial austerity bill.
 
Riot police fired volleys of tear gas to push back protesters trying to overturn barriers, while the demonstrators pelted police with bottles and trash.
 
Greek deputies are set to back more austerity measures today as thousands of protesters vented their anger against a bill that has to be passed for the country to get crucial bailout funds and avoid a devastating default on its debts.