LONDON, January 19. /TASS/. An unidentified vessel came under attack around 85 nautical miles southeast of Yemeni city of Ash Shihr, the United Kingdom Maritime Trade Operations said on Thursday.

"UKMTO as received a resport of an incident 85NM South East of Ash Shihr, Yemen," the authority said.

Meanwhile, Reuters quoted Ambrey, a UK-based maritime security company, as saying that four unmanned aerial vehicles (UAVs) approached and circled a Marshall Islands-flagged, US-owned tanker approximately 87 miles southeast of Yemen's Mukalla.

"One of the UAVs reportedly fell into the water. No damage or injuries were reported. The tanker was not impacted and continued its voyage," the agency quoted the company as saying in a statement.