"Germany has not recently suffered a large-scale attack from Islamist militants like those seen in neighbouring Belgium and France.
But it was shaken by two smaller attacks in Bavaria over the summer, one on a train near Wuerzburg and another at a music festival in Ansbach that wounded 20 people. Both were claimed by Islamic State."
"They're saying they had credible information that ISIS or al-Qaeda were planning attacks and focusing on the upcoming holiday season."