Royal Navy says it received reports of vessel attacked off Yemen

UKMTO advises mariners to exercise extreme caution in the area following the incident in the Red Sea

The Royal Navy's maritime information service has received reports of an attack on a vessel near Yemen's port of Ras Isa and an investigation was being conducted.

In an advisory issued at 2150 GMT on Sunday, the United Kingdom Maritime Trade Operations (UKMTO) - part of Britain's Royal Navy - advised mariners to exercise extreme caution in the area.