Police in the southern German city of Ulm are investigating what drove a man to take six people hostage on the city’s central cathedral square after ending the incident with gunfire. The hostages were unharmed, but the suspect was seriously injured and was operated on in hospital. “The investigating authorities are currently checking with the doctors treating him whether the accused is fit for questioning so that he can be brought before the competent magistrate,” a statement said on Saturday. It emerged later that the weapons the man used in the incident were airsoft guns that looked deceptiv…