MILAN — Investigators on Saturday sought to hunt down where the Berlin Christmas market attacker got possible logistical support to cross at least two European borders and evade capture for days before being killed in a police shootout during a routine stop in a Milan suburb.

Tunisian fugitive Anis Amri’s fingerprints and wallet were found in a truck that plowed into a Christmas market in Berlin on Monday night, killing 12 people and injuring 56 others. Despite an intense, Europe-wide manhunt, Amri fled across Germany, into France and then into Italy, traveling at least part of the way by train, before being shot early Friday on foot outside a deserted train station.

The Islamic State group has claimed responsibility for the Berlin attack, but so far little is known about any possible logistical network backing the 24-year-old fugitive.

Italian investigators were working to see if the Tunisian had any connections in the Milan area. Italy was his port of entry into Europe in 2011 and he spent more than three years in Sicilian jails. But an anti-terrorism official said there was no evidence that he had ever been in or around Milan before Friday’s shootout.

In Tunisia, the Interior Ministry announced the arrest Friday of Amri’s nephew and two others suspected of belonging to the same extremist network.

The ministry said in a statement that Amri, through an alias, had sent his 18-year-old nephew Fedi some money through the post office to join him in Europe and join the Abou Walaa network. Amir claimed to be the network’s emir.

The ministry said during questioning, the nephew said he was in contact with Amri via Telegram’s encrypted communications to avoid detection. He told police that Amri had recruited him to jihad.

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