Noida, April 23 -- Two Kanpur-based men, including a police constable, were arrested on Tuesday for allegedly robbing two Noida residents of Rs.18.7 lakh at gunpoint with the help of four friends posing as Special Task Force (STF) officers in Sector 76 on the intervening night of April 18 and 19, police said, adding that Rs.6 lakh in cash, two laptops, two mobile phones, and two SUVs used in the crime were recovered from their possession....