A demonstrator kicks a riot policeman during clashes in central Athens on Tuesday, June 29, 2010. Some 16,000 people took part in two separate demonstrations, the second of which turned violent as stone-throwing youths fought with riot police. Public services shut down across Greece Tuesday as workers walked off the job in a new nationwide general strike that disrupted public transport, left hospitals operating on emergency staff and pulled all news broadcasts off the air. (AP Photo)