At least 11 CRPF personnel were martyred on Monday in an encounter with Maoists in Chhattisgarh's Sukma district. The encounter took place when Maoists fired at a patrolling party in Burkapal-Chintagufa area of the worst Maoist-affected district in the state's south Bastar area. Recently, 12 CRPF personnel were martyred in the same district in March in another Maoist ambush.