Taiwan joins the massive international search for a Malaysia Airlines jetliner.<br/> <br />For four days ships and aircraft have been scouring the waters off Malaysia and Vietnam for a trace of the missing aircraft with 239 people on board.<br/> <br />Flight MH370 left Kuala Lumpur on Saturday for Beijing, vanishing from radar screens soon after takeoff.<br/> <br />With no clues to go on, investigators had focussed on two passengers who had stolen European passports.<br/> <br />Malaysia's chief of police said one of them was a young Iranian -- Pouria Nour Mohammad Merdad -- who appeared to be an illegal immigrant. Investigations are continuing to look into a second man using stolen documents.<br/> <br />(SOUNDBITE) (English) INSPECTOR GENERAL KHALID ABU BAKAR SAYING:<br/> <br />"We have been checking his background, we have also checked him with other police organization, on his profile. And we believe that he is not likely to be a member of any terrorist group. And we believe that he is trying to migrate to German
