Mines attached to the hulls of ships and set off with timers likely caused blasts that have damaged two crude oil tankers in the Mediterranean Sea since January, three sources close to the investigation said on Monday.At least five vessels have been damaged, including explosionson the Greek-managed tankers Seacharm and Seajewel which Reuters reported last week. The incidents have raised concerns of a new security threat in the typically safe waters of the Mediterranean, just as the shipping industry is dealing with attacks in the busy Red Sea route.It is not clear who is responsible for the alleged attacks. The vessels had recently called at Russian ports, according to ship tracking data and sources.
