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"According to the Polish owner of the Truck Company, the driver was a mild peaceful man and was found killed inside the truck. Looks like he was hijacked and murdered by ISIS, which already claimed that all."

According to Die Velt, the driver is a Pakistani refugee: Navid B., 23 years old.

Further from Die Velt:

"The Berlin special mission commandos stormed a hangar at Tempelhof Airport, where an asylum shelter is located...Four young men were questioned at the police station in the refugee camp on the grounds of the former Tempelhof Airport, but there were no arrests."
"The suspect was known under the names David and Navid B., born on January 1, 1993 in Turbat, Pakistan. He was admitted to Germany in February 2016, and granted a residence permit June 2016."
"According to the Brandenburg Ministry of the Interior, the Polish passenger of the alleged assassin was probably shot."
"The AfD chairwoman, Frauke Petry, indirectly gave the federal government joint responsibility for the alleged attack. "The milieu in which such acts can flourish has been negligently and systematically imported over the last one and a half years." Petry added: "Germany is no longer safe."
"Klaus Bouillon (CDU), Chairman of the Interior Ministerial Conference, speaks of a "war state". He told Saarland radio: "We are in a state of war, although some people who want to see only the good, cannot see"."