Italian police have arrested five people connected to the Tunisian man who carried out the 2016 Berlin Christmas market lorry attack and was later killed in a shootout with police in Italy.
In a tweet on Thursday, police said one of the five was believed to have procured the fake Italian identity papers that allowed Anis Amri, a failed asylum-seeker, to move around Europe.
Amri killed 12 people when he hijacked a lorry and drove it into a crowded Berlin Christmas market on December 19, 2016.
The attack was later claimed by the Islamic State group.
Using fake documents, he fled to Italy and died in a shootout with police near Milan four days later.
The arrests were the latest in a marked uptick in recent police operations targeting suspected extremists.