The Maltese-flagged merchant vessel Chelsea 3 was attacked by three unidentified drones roughly 14 nautical miles off the Bulgarian coast, in the exclusive economic zone, with two sailors injured, according to TASS, which cites the maritime.bg site.

The crew sent a distress signal on Monday night and was evacuated to Varna, with the vessel kept afloat, according to TASS, which cites the maritime.bg site.