In a fire accident, the Warangal Congress candidate Sircilla Rajaiah's daughter-in-law Sarika and her three children were burnt alive. It is learnt that fire mishap occurred in Rajaiah's house at Revenue colony in Warangal in the early hours of Wednesday. However, some locals said that gas cylinder blast might have been the reason for fire accident. Sarika and her three children were sleeping on the first floor when the mishap took place. Police are investigating whether fire accident occurred due to gas cylinder blast or Sarika set herself and her children on fire.