After investigations into the area surrounding the attacker at the Berlin Christmas market, the Italian police arrested three suspected document forgers in the Naples area.
Law enforcement accuses the suspects of forging Italian passports and aiding and abetting illegal immigration. This was announced by the police in Naples on Thursday.
A fourth alleged perpetrator was arrested by European arrest warrant in Rotterdam, Netherlands.
According to their own statements, the investigators found the suspects from Ghana, Senegal and Guinea through investigations into the terrorist attack on the Berlin Christmas market in 2016 by Anis Amri. This had benefited from the machinations of the criminal gang to forge identity papers.
As a result, investigators targeted two printers in Naples where the forged documents were produced.
Police also screened about 70 people, mostly Tunisian and Central African nationals residing in Italy, who are said to have had links to the gang, the statement said.