Germany's federal prosecution announced Wednesday that local police had arrested a 40-year-old Tunisian citizen who is suspected of helping Anis Amri, the terrorist who murdered 12 people and injured dozens of others in the December 19 truck attack on Berlin's Christmas market. The suspect was identified from a search of the cellular telephone found in Amri's possession after the terrorist was shot dead by an Italian policeman in Milano three days after the attack. The German police, which raided the suspect's home and business, will decide on Thursday whether to extend the arrest and continue to question him. Meanwhile, the Dutch National Prosecutor's Office said Amri was seen passing through Holland several days before the attack. DEBKAfile's sources report that if it is true, the terrorist and his handlers avoided arrest, questioning and investigation, as well as any effort to thwart the attack, by the intelligence and security services of at least four European countries: Holland, Germany, France and Italy.