The guerrillas ambushed the personnel and a gun battle ensued. In battle, two CRPF personnel were killed and five were injured.
Initial reports said that the two personnel were killed in a cross-fire of CRPF parties.
However, CRPF officials and Jharkhand director general of police GS Rath denied any cross-firing.
But Rath said the Ranchi deputy inspector general of police would probe the incident and file the report.
Maoists are active in 18 of the state's 24 districts.