Italian police and forensics experts gather around the body of suspected Berlin truck attacker Anis Amri after he was shot dead in Milan on December 23, 2016.  
The Tunisian man suspected of carrying out the deadly Berlin truck attack at the Christmas market was shot dead by police in Milan on December 23, Italy's interior minister Marco Minniti said. The minister told a press conference in Rome that Anis Amri had been fatally shot after firing at two police officers who had stopped his car for a routine identity check around 3:00 am (0200 GMT). Identity checks had established "without a shadow of doubt" that the dead man was Amri, the minister said. / AFP / DANIELE BENNATI        (Photo credit should read DANIELE BENNATI/AFP/Getty Images)
How the Berlin attack unfolded
01:10 - Source: CNN

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Investigators search man's home and office

Berlin attacker had Tunisian's phone number, officials say

CNN  — 

German federal police have detained a Tunisian man who had possible ties to Berlin Christmas market attacker Anis Amri, according to a statement from the federal prosecutor’s office released Wednesday.

Federal police searched the 40-year-old man’s home and office with a search warrant from the federal court December 26, the statement said.

The man’s phone number was found on a mobile phone belonging to Amri, according to the prosecutor.

“Further investigation points to the assumption that he could have been involved in the attack. He was therefore detained,” the statement said.

“Whether or not the current suspicion against the detainee will become more substantial will be subject to further investigation,” it added, saying the probe will determine whether an arrest warrant should be issued for the man.

A policeman and firemen stand next to a truck on December 20, 2016 at the scene where it crashed into a Christmas market near the Kaiser-Wilhelm-Gedaechtniskirche (Kaiser Wilhelm Memorial Church) in Berlin.
German police said they were treating as "a probable terrorist attack" the killing of 12 people when the speeding lorry cut a bloody swath through the packed Berlin Christmas market.
Berlin truck caught on dashcam
00:55 - Source: CNN

Amri killed the driver of a tractor-trailer loaded with steel and drove it to central Berlin, where he mounted a sidewalk and plowed through an open-air Christmas market December 19, killing 12 people and injuring at least 48 others.

Anis Amri mother Berlin Christmas market attack mother
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As the manhunt for Amri got under way, Dutch police say it is “likely” but “not 100% sure” that he traveled through the Netherlands on his way to Milan, where he was killed in a shootout with Italian police December 23.

“It might be the case, not 100% sure. [Amri] might have traveled through city of Nijmegen but it’s not clear what happened after that. But it is likely,” the Dutch police press office told CNN Wednesday, based on information from the attorney general.

There was “direct and indirect evidence,” police said.

Ansi Amri facebook video
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A SIM card was found in Amri’s possession that was part of a free promotional deal being offered by a Dutch cell phone provider between December 20 and 22 in the cities of Nijmegen, Breda and Zwolle.

“The SIM was not used,” the press office said.