BERLIN -- German officials presented mounting evidence Thursday that Anis Amri was behind the wheel of a truck that smashed into a Christmas market in Berlin, killing 12, as authorities across Europe pressed ahead with their manhunt for the 24-year-old Tunisian, who has evaded capture since the attack.

Police raided properties in Berlin and the western state of North Rhine-Westphalia where Amri is believed to have spent time. They also swooped on a bus in the southwestern city of Heilbronn after receiving a tip that turned up nothing.

No arrests were made, said Frauke Koehler, a spokeswoman for federal prosecutors. Even so, investigators were increasingly confident Amri carried out the rampage after finding his fingerprints in the cab of the truck that had been hijacked shortly before Monday's attack.

"We can tell you today that there are additional indications that this suspect is with high probability really the perpetrator," Interior Minister Thomas de Maiziere said after visiting the Federal Criminal Police Office along with Chancellor Angela Merkel.