Tunisian security forces have arrested three suspected terrorists after uncovering their links to Anis Amri, the Tunisian national believed responsible for the Berlin Christmas market attack that killed 12 people. <br/><br/>Tunisia's Interior Ministry today said, Amri's nephew was among the three men and had been in touch by social media messaging with Amri, who was killed yesterday by Italian police. In a video released after his death, Amri is seen pledging his allegiance to terrorist group Islamic State. <br/><br/>Meanwhile, In Spain, Interior Minister Juan Ignacio Zoido told a radio station that intelligence services are investigating a possible connection via Internet between Amri and a Spanish resident.