A man wielding a knife in the German city of Würzburg on Friday killed three people and injured several others, according to local authorities.<br />'' <br />''The suspect, a Somali man, was shot in the thigh before being arrested. Police said, he had been violent and mentally unstable and had recently received psychiatric treatment.<br />'' <br />''<span style="color: #222222;">Bavarian Interior Minister Joachim Herrmann told reporters that five injured were in serious condition.</span><br />