VANCOUVER, British Columbia (Reuters) – A surge in gang violence is hurting Vancouver's image as it prepares to host the 2010 Olympics, the city's mayor said on Friday. Police publicly acknowledged for the first time that the Vancouver area was in the midst of a "gang war" between several organized crime groups fighting over the illegal drug market. While the violence is still tame compared to that seen in other parts of the world, it is not something Vancouver is used to dealing with, Mayor Gregor Robertson said. "Vancouver has never been known for this, so in terms of our...