"Kamlesh alias Indrajit Yadav was arrested yesterday following a tip-off that he was at Damaran under Ranka police station. He was one of the Maoists involved in the two attacks," Superintendent of Police Michael S Raj told reporters here.
A 9mm pistol, which he had looted after killing police official Rajbali Choudhary on January 21, was recovered from him, he said.
Yadav was one of the active members of the Maoist 'dasta' (firing squad), he said.
The police has already arrested four other Maoists on February 29 in connection with these attacks.
On December 3, former Jharkhand assembly speaker Inder Singh Namdhari had escaped Maoist attack on his convoy that killed 10 policemen in Latehar.
In the second attack on January 21, the left-wing guerrillas blasted landmine to kill 13 policemen at Bariganwa forest in Garhwa district.