Somali pirates on Thursday hijacked a German gas tanker with 13 Filipino and Indonesian crew in the Gulf of Aden, a Kenyan maritime official said. "There was a heavy exchange of gunfire (but) the crew is believed to be safe," said Andrew Mwangura who runs the Kenya chapter of the Seafarers Assistance Programme. He added that it was still unclear whether the exchange was between different groups of hijackers or with foreign navies patrolling the pirate-infested waters. The MV Longchamp, with a crew of 12 Filipinos and one Indonesian, was transporting liquefied petroleum gas "from Europe to the Far East," Mwangura said, without giving exact locations. The pirates took control of the Bahamas-flagged vessel and headed for the Somali coast, he added.