Lagos - Three Chinese workers kidnapped by gunmen in Kogi state were released unhurt on Saturday, police said.
"I can confirm to you that the abducted Chinese workers have been released. They were freed today through a joint operation by the police and other security agents," state police spokesman Sola Collins Adebayo told AFP.
He said the hostages who were seized on Friday at a quarry outside Lokoja were unharmed, but declined to say if a ransom was paid.
A senior police officer told AFP earlier on Saturday that the gunmen had stormed the quarry and engaged the police on guard there in a shootout that left one officer dead and another wounded.
The assailants then escaped with their hostages on foot through the bush, with the police on their trail.
Also read: Policeman killed as gunmen abduct three Chinese in Nigeria
Kogi state has seen a wave of abductions targeting foreigners this year.
Two weeks ago, two other Chinese nationals were kidnapped in the state, while an American missionary was taken from her school last month.
The missionary, who works in the village of Emiworo where her Free Methodist Church runs a community organisation, was released last week.
State police said they were unaware of any ransom paid for her release.