TERROR: Tunisian Man Detained In Connection To Berlin Market Attack.

The 40-year-old, who wasn’t identified, was detained during a search of his home and business, federal prosecutors said.

The man’s telephone number was saved in the cellphone of Anis Amri, a fellow Tunisian believed to have driven a truck into the market on Dec. 19. Amri, 24, was killed in a shootout with police in a suburb of Milan early Friday.

Of the new suspect, prosecutors said in a statement that “further investigations indicate that he may have been involved in the attack.”

Twelve people died in the truck attack. The Islamic State group has claimed responsibility.

Prosecutors have until Thursday evening to determine whether the case against the 40-year-old is strong enough for them to seek a formal arrest warrant. That would allow them to keep him in custody pending possible charges.

Investigators are trying to determine whether Amri had a support network in planning and carrying out the attack, and in fleeing Berlin. They’re also trying to piece together the route he took from Berlin to Milan.

The Schengen Area made it possible to travel throughout most of Europe with less hassle, but it also has made it easier for terror suspects to flee between police jurisdiction and intelligence agencies which are still, unlike travelers and terrorists, largely confined to their home countries.