Four employees of the Director General of Mines Safety (DGMS) were freed from Maoist custody on Friday, a day after they were kidnapped while on an inspection of an abandoned asbestos mine at Roro village in West Singhbhum district.
Police initially rescued two of the four employees, before the rebels freed the remaining duo.
"We were tracking them constantly and they released the captives under pressure," said Narender Kumar Singh, superintendent of police of West Singhbhum district.
DGMS deputy directors BB Satiyar and Saket Bharti were among those kidnapped.
The rescued officials were in safe custody, Singh said.
Satiyar and Bharti, along with two junior staffers of DGMS, were abducted from a place 24 km from the district headquarters, Chaibasa.
They were inspecting complaints from villagers that waste from a mine, which was closed in 1991, was damaging their fields.
The Chaibasa police swung into action after the driver of the vehicle carrying the DGMS personnel informed police about the abduction.
Singh had confirmed the involvement of the People's Liberation Front of India (PLFI), a Maoist splinter group, in the abduction.