**Three Britons and a Colombian kidnapped a week ago in Nigeria’s Delta region have been freed, police have said.**Gunmen snatched the group, who were working for oil giant Shell, near the city of Port Harcourt last Tuesday, killing a Nigerian guard.
A police spokeswoman told AFP news agency all four had been released and were “looking ok”.
The oil-producing region is notorious for kidnappings by militants, who demand a greater share of its wealth.
But the Delta has been relatively calm since most major militant groups agreed to lay down their arms last year after the government offered an amnesty.
Shot dead
This is the first violent attack on foreigners in the region for many months.
The Nigerian gunmen snatched the four workers last Tuesday morning as they made their way to work at a power plant, police said.
Their police escort was shot dead and the driver was also believed to have been shot.
A police search in and around the town of Aba, some 30 miles (50km) north-east of Port Harcourt, followed.
At the time, Shell expressed concern for the safety of its contractor staff.
The Foreign Office said it was aware of the reports the men had been freed and it was making inquiries.