The Syrian government is denying 3.5 million civilians access to UN aid convoys in defiance of a Security Council resolution that has seen the crisis worsen, Western powers warned Friday. Britain and the United States told the United Nations that Damascus bears overwhelming responsibility for denying UN relief workers access to an escalating number of people in need. The Syrian government has allowed aid convoys to cross only one of eight border crossings identified by the United Nations as a priority, Western ambassadors said. Since February 22, 300 cases of ***ual violence have been recorded in and around Damascus alone, and hundreds of thousands more Syrians had been newly displaced, Amos added.