anis amri, berlin terror attack, berlin christmas attack
Handout pictures released on December 21, 2016 and acquired from the web site of the German Bundeskriminalamt (BKA) Federal Crime Office show suspect Anis Amri searched in relation with the Monday's truck attack on a Christmas market in Berlin.Reuters

The 24-year-old Tunisian man suspected of carrying out the Berlin truck attack was shot dead by police in Milan, Italy on Friday. A police officer was also injured in the shootout.

Anis Amri was absconding since the deadly truck attack in the German capital on the evening of December 19. A truck was driven into the Christmas market next to the Kaiser Wilhelm Memorial Church in Berlin in which 12 people were killed and 56 others were injured.

One of the victims was the truck's original driver, Lukasz Urban, who was found shot dead in the passenger seat. A suspect was arrested and later released due to lack of evidence.

According to reports, Amri' papers from the asylum office were found in the truck. The investigators also found documents announcing a stay on his deportation inside the truck.

Police said that a man matching Amri's description was spotted in Aalborg, around 450 miles north of the German capital. The police from the North Jutland region also reported that the man was between 20 to 30 years of age. He was seen with a beard, wearing a black knitted hat, glasses and carrying a black shoulder bag.

Amri was also under covert surveillance by the German police for months before it was called off in September. There was an investigation against Amri earlier this year on suspicion of "preparing a serious crime endangering national safety." He was due to be deported earlier this year, according to Ralf Jäger, the interior minister of North Rhine-Westphalia state.

Amri repeatedly changed houses and lived in several places in Germany, Jäger said. However, since February, he was living in Berlin most of the time, but had visited North Rhine-Westphalia recently. Amri used six aliases and three nationalities.