I've heard news stories about this on about 4 different AM and FM radio stations, and NONE (not a single $%^&@# one of them) ever used the words "Muslim" or "Islam" or "Christian." They'll only say that a Tunisian man is the suspect, and the truck ran over people at a "Christmas market."
P.S. The guy the German authorities arrested near the scene has been released. He's an Islamic refugee, but has no proven ties to ISIS or this incident.
The real killer seems to be another [Muslim] refugee, who hijacked the truck, killed the driver, and then used it to run down the Christians attending the Christmas festival.
ISIS claims that this terrorist is one of their "soldiers" for jihad, although ISIS didn't claim that they organized the attack; it could have been just a lone wolf terrorist sympathizer striking a blow on his own.
http://www.cnn.com/2016/12/20/europe/berlin-christmas-market-truck/