<sod >When large crowds gathered for Canada Day and the Calgary Stampede parade, authorities had strategically placed city vehicles to block anyone attempting to drive vehicles into pedestrians, a tactic used by terrorists in France and England.< eod>< sod > "   Calgary police have previously revealed some of the tactics they employ to thwart acts of terror. When large crowds gathered for Canada Day and the Calgary Stampede parade, authorities had strategically placed city vehicles to block anyone attempting to drive vehicles into pedestrians, a tactic used by terrorists in France and England. Calgary police are offering support to the Edmonton Police Service and the RCMP Integrated National Security Enforcement Team as authorities continue to investigate the attack.  "The events that occurred (Saturday) night in Edmonton were both shocking and disturbing," police said.< eod>