( CNN ) -- A Taiwanese fishing vessel has not been heard from since reporting that pirates were attacking it in the Indian Ocean several days ago , authorities said Thursday . The ship has a crew of 26 from Taiwan , China and Vietnam , the European Union Naval Force Somalia said in a statement . On Christmas morning , the vessel FV Shiuh Fu reported being under pirate attack about 120 miles off the northeast tip of Madagascar , the statement said , but `` no further communication with the vessel has been possible '' since then . Authorities said they do not have information about the condition of the ship or its crew . Pirates are now holding 26 vessels and 613 hostages off the coast of Somalia , where many pirates are based , the European Union Naval Force Somalia said .
The ship reported being under attack on Christmas Day . A spokesman for the US Navy said it was aware of reports that a Russian warship had entered its territorial waters in international waters. Pirates now hold 26 vessels and 613 hostages off the coast of Somalia .