Attackers firing machine guns and rocket-propelled grenades boarded a ship, en route to South Africa from India, off the coast of Somalia on Thursday.

The British military’s United Kingdom Maritime Trade Operations centre issued an alert over the attack, warning ships in the area. The private security firm Ambrey also said that an attack was underway, saying it targeted a Malta-flagged tanker heading from Sikka, India, to Durban, South Africa.