Troops from Thailand and Cambodia have clashed at a disputed portion of their border early on Thursday, with both sides accusing each other of firing the first shot. The Thai military said Cambodian soldiers opened fire near the Khmer temple Ta Muen Thom, where tensions have run high in recent weeks. Cambodia's defence ministry however said its soldiers were responding in self-defence after Thai troops fired the first shots. Cambodia had sent a surveillance drone into the area before deploying heavily armed troops, the Thai military said, adding that at least two Thai soldiers were injured.