Pirates believed to be operating from a hijacked Chinese fishing vessel have attacked a Teekay LNG Partners vessel and boarded a tanker in the Gulf of Guinea.

The incident involving the 138,000-cbm LNG carrier Madrid Spirit (built 2004) took place on Monday while the ship was underway 49 nautical miles (91 km) off Sao Tome and Principe.

Security company Ambrey said six pirates in one speedboat opened fire on the ship, aiming towards to the bridge.