By Riham Alkousaa BAD AROLSEN, Germany (Reuters) -German investigators are trying to make sense of “confused” statements from a 29-year-old man who rammed his car into a group of schoolchildren and killed a teacher in Berlin, the city’s mayor, Franziska Giffey, said on Thursday. The authorities have established that the German-Armenian man was severely mentally ill but had yet to understand any motive for Wednesday’s incident, or any possible connection to posters about Turkey found in the back of his car, she said. Families were in mourning for the teacher who was killed while taking schoolch…