Chandigarh, Feb. 25 -- UT police are investigating the involvement of a senior Punjab Police officer's son in a firing incident that took place at The Willow Cafe in Sector 10, Chandigarh, on February 19. According to police sources, the pistol used in the firing is suspected to be a service weapon, though the weapon is yet to be recovered. Police authorities had earlier issued a lookout circular for two suspects who were accompanied by a security guard....