A maritime policeman on a tag-boat guards oil tanker Aris-13, which was released by pirates, as it sails to dock on the shores of the Gulf of Aden in the city of Bosasso, northern Somalia"s semi-autonomous region of Puntland, March 19, 2017. (Photo: Reuters)
Somali pirates are suspected of hijacking a bulk carrier ship, the head of a maritime security company said on Saturday, in the latest in a string of attacks after years of calm.