**Three British people and a Colombian have been seized in Nigeria’s oil-rich Delta region, security sources say.**Kidnappers snatched the four near the city of Port Harcourt, reportedly killing a Nigerian guard.
The oil-producing region is notorious for kidnappings by militants, who demand a great share of its wealth.
But the Delta has been relatively calm since most major militant groups agreed to lay down arms last year after the government offered an amnesty.
Reuters news agency reported that gunmen snatched the four on Tuesday morning as they made their way to work.
Security sources told Reuters that a Nigerian security officer was killed in the incident.
No group has yet claimed responsibility.