yenagoa nigeria four britons kidnap nigeria southern delta state police official say wednesday police attempt rescue four people take unidentified gunmen oct. 13 say andrew aniamaka spokesman delta state police kidnap ransom common problem part nigeria number foreigners last years kidnap niger delta region hold country crude oil country economic mainstay abductors make contact investigations know motive rescue without jeopardise live say aniamaka information available us show missionaries give free medical service say add british nationals work rural area increase crime southern region last year coincide series attack energy facilities however militant attack energy installations far year four britons kidnap nigeria 's delta state police