German police have released a Lebanese man from custody whom they had arrested in connection with a suspected plan to attack Iraqi Prime Minister Ayad Allawi during a visit to Berlin on Friday. The federal prosecutor's office on Sunday said the man had been arrested on Saturday on suspicion of being a member of a terrorist organization. Arrest orders for three other men held since Friday in connection with the suspected plot were issued on Saturday, meaning the men can be held in custody while an investigation is carried out. A spokesman for the prosecutor's office said the men still in custody were 30-year-old Rafik Y., arrested in Berlin, Masin H., 22, arrested in Augsburg, and Ata R., 31, arrested in Stuttgart. They are suspected of being members of the militant group Ansar al-Islam, which originated in the Kurdish-held region of northern Iraq. The US accuses the group of working closely with al Qaeda. Allawi's visit to Berlin was cut short after the suspected plan was discovered. Several meetings were cancelled.