Two Americans and two Canadians were freed after being kidnapped in the Nigerian state of Kaduna, a police spokesman said, as it emerged five oil workers were abducted in the southern Niger Delta region.
The Americans and Canadians were ambushed by unknown gunmen last week while travelling from Kafanchan in Kaduna state to Abuja.
In a separate incident, police in the Delta state said five Nigerian oil workers from local firm Sahara Energy were kidnapped. Delta state police said no arrests had been made.
Kidnapping, usually for ransom, is common in parts of Nigeria, though abductors usually target other Nigerians. The kidnapping of foreigners is not uncommon.
Mukhtar Aliyu, a spokesman for Kaduna state police, said the Americans and Canadians were freed on Friday.
“It was the efforts of the police, through the directive of the inspector general of police, that yielded their release,” he said. No ransom was paid.
The road connecting Abuja and Kaduna has long been targeted by kidnappers. Two German archaeologists were abducted in the region last February and later freed.