Striking Greeks take to tension-filled streets in austerity protest

By Renee Maltezou and Lefteris Karagiannopoulos ATHENS (Reuters) - Striking Greeks took to the streets on Thursday to protest austerity measures, setting Alexis Tsipras' government its biggest domestic challenge since he was re-elected in September promising to cushion the impact of economic hardship. As Greece's foreign lenders prepared to meet in central Athens to review compliance with its latest bailout, thousands marched in protest at the relentless round of tax hikes and pension cutbacks t