Nigeria ? Gunmen stormed an offshore oil platform run by Royal Dutch Shell in Nigeria and kidnapped four foreign workers, including an American, while apparent sabotage ruptured a pipeline at a facility processing 106,000 barrels of crude daily, officials said Thursday.

Gunmen in three boats seized the workers from a support vessel attached to the oil platform Wednesday, Shell spokesman Andy Corrigan said in London.

Military spokesman Maj. Said Hameed said the four included an American, a Bulgarian, a Briton and a Honduran, and “efforts are being made to secure their release.”

In a separate incident, a major pipeline feeding Shell’s Forcados oil export terminal ruptured overnight at Brass Creek, forcing the company to stop production of 106,000 barrels of oil daily, Shell said.