In Thailand, four army rangers were killed in a roadside bomb blast by suspected Muslim insurgents in Southern Thailand today. <br/><br/>Spokesman for the security forces in the region, Pramote Prom-in, said, the bomb was planted under a road currently under construction in Pattani. He said six persons sustained injuries in the blast. Today's blast followed roadside bombs last week that killed two soldiers and wounded more than 20 people in Yala. There was no claim of responsibility for the blast so far.<br/><br/>A decades old-separatist insurgency in predominantly Buddhist Thailand's largely Muslim provinces of Yala, Pattani, and Narathiwat has killed more than 6,500 people since 2004. The three southernmost provinces were part of an independent Malay Muslim sultanate until they were annexed in 1909.