RIHAM ALKOUSAA and JAN SCHWARTZ A gunman in Germany shot dead six people before killing himself at a Jehovah's Witness worship hall in Hamburg, authorities said, in an attack that is bound to renew calls for stricter gun controls. Eight other people were wounded, including a seven-month pregnant woman who lost her unborn daughter, police and prosecutors said at a news conference. Officials said they had been tipped off about the perpetrator but had not taken away his legally-owned gun before the shooting at an event on Thursday night. The killer's motive remained unknown but a political reason had been…