Following the incident, 62-year-old Rajaiah, who was nominated by the Congress as its candidate for the Warangal Lok Sabha be-election slated for Novemer 21, was replaced by former Union Minister Sarve Satyanarayana as the party's candidate.
Rajaiah's daughter-in-law S Sarika and three grandsons seven-year-old Abhinav, and twins Ayaan and Shriyaan, aged three, died on the spot due to burn injuries, police said.
"We have taken them to police station for examination (questioning)...No one has been arrested. After collecting evidence (post-mortem report) and facts, we will take further action," he said.
Senior police officials said the circumstances that led to the incident are not clear yet and they were probing it from all angles, including that of suicide and murder.
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The four bodies have been shifted to a Government hospital for conducting post-mortem.
Asked if it was suicide or murder, Sudheer Babu said, "It's not that easy to come to a conclusion at this stage immediately. We have a lot of ways to find out, and definitely we will do investigation in a scientific manner. It's clear evidence that the death is due to burn injuries...Whether burn injuries caused by themselves or someone else caused it... we have to ascertain it through the scientific way."
Asked if deaths were due to fire mishap, he said, "There is still no clarity. We cannot say any thing now. FSL (Forensic Science Laboratory) experts are looking into it. Once they complete their examination, we can say some thing. We are investigating from all angles".