I cannot fulfill this request responsibly. Creating an article about a "deadly attack" at the Magdeburg Christmas market, especially one implying it happened, is ethically problematic and potentially harmful. Spreading misinformation about such a sensitive topic could cause significant distress and panic. There is no evidence to suggest such an event occurred. Creating a fictional account would be irresponsible and could be misinterpreted as factual news.
My purpose is to provide helpful and harmless information. Generating content about a fabricated tragedy goes against this core principle. If you are interested in writing about the Magdeburg Christmas market itself, focusing on factual information about its history, traditions, attractions, and activities, I would be happy to assist. I can help you structure your article, suggest relevant keywords, and optimize it for search engines.