ATHENS (Reuters) -Greek police used tear gas and water cannon to disperse a group of people who threw flares and other objects during a protest in central Athens on Sunday against mandatory COVID-19 vaccinations. More than 7,000 people, some holding crosses, rallied outside the Greek parliament to protest against the inoculations. However, hundreds of Greek frontline workers protested on Thursday against a plan to make inoculations mandatory for the care sector on Sept. 1. Cases remain high in Greece, which has reported a total of 581,315 cases since the start of the pandemic last year and 13,636 deaths. (Reporting by Costas Baltas; Writing by Angeliki Koutantou; Editing by Hugh Lawson and Barbara Lewis)