The dramatic rescue of a Navios Maritime Acquisition product tanker off the UK coast has added to the security concerns of ships trading to the Gulf of Guinea.

The 75,000-dwt Nave Andromeda (built 2011) was rescued by the UK's elite special boat squadron after it sent out a Mayday when seven stowaways, which had boarded at Lagos, became hostile.

Before that, the vessel had reportedly been denied access to Spanish and French ports.