A Maltese-flagged cargo ship carrying thousands of tonnes of potentially explosive fertiliser is set to travel through UK waters.

Ruby, which is being accompanied by an escort tug, has reportedly been rejected by several countries due to its cargo.

The ship, owned by Maltese firm Ruby Enterprise, set off from the northern Russian port of Kandalaksha in July – with 20,000 tonnes of ammonium nitrate on board.

HM Coastguard is in contact with the vessel, which according to marine traffic data, was in the North Sea off the Kent coast on Thursday morning.

The national maritime emergency service said it will monitor the ship’s progress as it heads towards and through UK waters.

Though there is no suggestion of immediate danger from the cargo, the same chemical caused a devastating blast at a Beirut warehouse in 2020.

Ammonium nitrate is regularly transported around the world and used as fertiliser but is also used in explosives.

The ship is carrying seven times the amount of ammonium nitrate that caused the Beirut explosion.

Soon after departing Russia the Ruby briefly ran aground after reportedly encountering a storm.

It then continued its journey around the Kola Peninsula and docked in Tromsø, Norway.

Norway’s Maritime Authority told the BBC the vessel was inspected by DNV Group to ensure it met safety and environmental standards.

The group found damage to its hull, propeller and rudder, but the Ruby was still deemed “seaworthy”.

As a precaution, DNV Group, and the Maltese flag registry, insisted that a tug escort the vessel for the remainder of its journey.

Despite this, authorities in Sweden and Lithuania have reportedly banned the ship from entering their waters.

In recent weeks, the Ruby travelled south along Norway’s coast and through the North Sea.

The ship reportedly has had restricted manoeuvrability, though the BBC has been unable to confirm this.

On 25 September it anchored around 15 miles (25km) north east of Margate, in Kent, near the the Dover Strait – one of the world’s busiest waterways.

Its current destination is listed as Marsaxlokk, in Malta.

But Maltese authorities have told local media that the ship can only enter the country if it empties its cargo beforehand.

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