They struck with heavy gunfire and land mines in daylight at Jeerum Nullah, 400 kilometers (248 miles) from Raipur, at a contingent of 48 law enforcement personnel patrolling local jungles in an area notorious for Naxal violence, the Press Trust of India reported.
The attack was carried out near the site of a 2013 incident in which nearly the entire leadership of the state Congress was wiped out by Maoists. The 2013 attack killed 25 people.
Chhattisgarb Director General of Intelligence Mukesh Gupta told the Indian newspaper The Hindu most of the victims Tuesday were members of the Central Reserve Police Force, and others were Sukma District Police officers.
Pannilal Thakur, one of the police officers injured in the attack, told the Hindustan Times the patrol was on its way to provide security for highway construction workers.
There was no report of injuries to the attackers, who looted the security convoy of weapons, including three grenade launchers, before fleeing into the jungle, the Hindustan Times said.