Demonstrators Clash in Bush Protest By STEPHEN GRAHAM, Associated Press Writer BERLIN (AP) - Hooded youths and pro-Palestinian demonstrators clashed with police as President Bush (news - web sites) arrived here Wednesday, marring a peaceful protest by 20,000 people opposed to any widening of the U.S. war on terrorism. Pro-Palestinian demonstrators waving Palestinian flags and wearing the checkered Arab keffiyeh headdress burned American flags at a former Prussian parade ground, where earlier demonstrators had sunbathed in a picnic-like atmosphere. Nearby, youths pelted police in riot gear with bottles and stones. Plainclothes security officials isolated troublemakers, removing individuals from the crowd...