Gunmen attacked an oil services vessel off the coast of Cameroon close to Nigerian waters on Saturday, kidnapping one Ukrainian and three Filipino crew members, Reuters quoted security sources in Nigeria as saying. Two security contractors said around 30 suspected Nigerian militants in speedboats attacked the MV Sil Tide in the early hours of today morning around 14 km (9 miles) from the coast of Bakassi, on the Nigeria-Cameroon border. "Around five shots were fired. One person was injured and they got the three Filipinos and the Ukrainian," one of the security sources, who asked not to be named, told Reuters. Both sources said the attack happened in Cameroonian waters. One said the vessel was under Cameroonian naval escort.