COLOMBO - Sri Lanka’s army said Wednesday it agreed for the first time to probe war crime charges against its troops and investigate allegations of prisoner executions made in a British TV documentary. Army chief Jagath Jayasuriya appointed a court of inquiry to investigate charges that troops were responsible for killing civilians and prisoners in the final stages of their war against Tamil rebels in 2009, an army statement said. The dramatic U-turn came two days after the US warned that the Indian Ocean island would face censure at next month’s UN Human Rights Council meeting in Geneva.