Pirates who seized a Spanish tuna fishing boat off Somalia have demanded a ransom of more than 2.5 million euros for the release of the vessel and its 36 crew.The hijackers have also said they will not negotiate with Spanish authorities until two of their gang on trial in Madrid are freed. The Alakrana disappeared after being overrun by pirates two weeks ago. The Spanish navy arrested two men in the area around the same. They were transferred to Madrid and yesterday appeared in court on charges of illegal detention and armed robbery. Prosecuting piracy cases in the West has been problematic. Many suspects have avoided trial because of doubts over the jurisdiction of where they were captured. or Western governments’ fears the accused will try to claim asylum.