Agra, Aug. 13 -- Two minor siblings died when a roof of an old house collapsed in Kosi Kalan town of Mathura district on Monday night. Six others were injured and were sent for treatment after being rescued. Mother and father of deceased siblings are in serious condition, informed officials. The tragic incident took place at the house in Nikasa locality where a joint family resided. Roof of the hall in the house collapsed at 8 pm on Monday night and family members were trapped in the debris. Police and locals began rescue operation but could not save Ahil (12) and Mayara (8). Six others were referred to a higher center for treatment....