HISAR, April 8 -- The Hisar police have arrested six persons, who were trying to cross a police post in an ambulance, and seized 500gm heroin from their possession. Police spokesperson Vikas Kumar said cops from Agroha on the basis of a tip-off arrested six persons identified as Narender Bagari, Surender, Ravinder Kuleri, Salim Khan and ambulance driver Surender who were coming from Gurugram. HTC...