Earlier grenades were thrown at anti-government supporters, members of the People's Alliance for Democracy, as they marched on the airport, an apparent retaliation for a shooting. Last night 11 government supporters were injured after being fired on. Thailand is now almost irrevocably split between supporters of the government and the PAD. Hundreds of PAD supporters, some wearing masks and armed with metal rods and baseball bats, stormed past police and into the airport overnight, taking control of the passenger lounges and the control tower.