Calgary police at the entrance to Valley Brook Circle in northwest Calgary, Alberta Wednesday, September 12, 2012. Police were dispatched to the northwest neighbourhood after an anonymous complaint was made alleging a man was firing a pellet gun. Police were dispatched to the northwest neighbourhood after an anonymous complaint was made alleging a man was firing a pellet gun. Police were dispatched to the northwest neighbourhood after an anonymous complaint was made alleging a man was firing a pellet gun. The man holed up inside his home on Valley Brook Circle after police arrived on scene.They soon found out the man was wanted on outstanding warrants and believed that he may have a number of firearms inside the home.For the 14 hour operation, police blocked off the area and alerted neighbours to stay inside their homes.They eventually had to use tear gas on the suspect to get him to surrender. No one was injured during the incident.