Explosive device likely damaged Greek tanker off Libya last week, operator says

"Preliminary investigation findings clearly indicate that the explosion, the resulting fracture of the side shell plating, and the flooding of the engine room were caused by an external source - an unidentified explosive device," TMS Tankers said.

Maritime security sources told Reuters last week that a limpet mine may have caused the blast on Vilamoura, the fifth such incident to hit commercial shipping in the region in recent months.