Officials arrested three men in Tunisia on Saturday, including the nephew of suspected Berlin Christmas market attacker Anis Amri, on charges of "suspicion of belonging to a terrorist organization and connections with terrorist offenses," according to the country's Interior Ministry. Authorities say Amri and his nephew communicated through an encrypted messaging app and that Amri sent him money. The suspected killer, who was shot dead in Milan on Friday, asked his nephew to pledge his allegiance to the Islamic State. It's unclear if any of the three who were arrested—between ages 18 and 27—helped Amri escape from Berlin. None of the three men were named in the ministry's statement.