RAIPUR, India (AFP) - Suspected Maoist guerrillas ambushed a police patrol and shot dead six officers on Friday in the central Indian state of Chhattisgarh, a hotspot of left-wing extremism, officials said. Five more were injured in the attack in a forest in Bastar district, 350 kilometres (210 miles) south of the state capital Raipur, said the local head of police anti-Maoist operations, Ramniwas. Three suspected guerrillas were also killed in the gunbattle, said Ramniwas, who uses one name. A search was on for their bodies, he told AFP. The 16 policemen travelling on motorcycles came under attack when they were returning from a village.