The suspect, identified as a Tunisian national named Anis A., is also believed to have several IDs, according to various media reports.
Der Spiegel reports that his identity document has been found by investigators under the driver's seat in the truck cabin. The suspect was born in Tataouine, Tunisia in 1992, according to the report.
Bild, however, quoted police sources which suggest that Anis A. had several passports in different names with ages between 21 and 23.
All of the passports have surnames starting with the letter A, according to Allgemeine Zeitung Mainz. One of his aliases could be Ahmed A., the newspaper reports. The man's German residence permit was reportedly issued in the state of North-Rhine Westphalia.