A warship from an international naval force has been deployed to track three vessels and their 57 crew that were hijacked in an unprecedented spate of attacks by pirates off the coast of Somalia, AP quoted an international maritime official as saying Friday. Noel Choong of the International Maritime Bureau also called on the United Nations to do more to bring rampant piracy under control off Africa's eastern coast. Choong, who heads the IMB's piracy reporting center in Kuala Lumpur, said the coalition naval force based in the region is monitoring the movement of the Iranian, Japanese and German vessels that were seized Thursday in the Gulf of Aden.