Sadly, this is not surprising news.
From the BBC:
German police are investigating a "probable terrorist attack" after a man ploughed a lorry [British for bus] into a Christmas market in the heart of Berlin, killing 12 people and injuring 48.The suspect described in the BBC article has been released. German authorities are now looking for a Tunisian refugee in regards to this barbarity.
The driver is an Afghan or Pakistani asylum seeker, according to security sources cited by DPA news agency.
He reportedly arrived in Germany in February as a refugee.
The daily Tagesspiegel said the man was known to the police for minor crimes, but not terror links.