German media report that authorities have identified and are searching for a suspect in connection with the fatal truck attack on a Berlin Christmas market.

The Allgemeine Zeitung in Mainz, weekly Der Spiegel and daily Welt reported Wednesday that police found documents in the truck cab that were issued to a Tunisian man. They did not cite any sources for the information.

German authorities had to release two suspects arrested in the wake of Monday's attack due to insufficient evidence. They had no immediate comment on Wednesday's reports.

Twelve people were killed and nearly 50 were injured in the attack on the Christmas market in Berlin.