Rao, who was associated with Bajrang Dal, was killed in broad daylight yesterday by four assailants who came in a car.
All the four were arrested after a hot chase by the police.
Reddy gave the names of the arrested as Naushad, Pinky Nawaz, Rizwan and Nirshan.
Maintaining that there was no intelligence failure, he said it is difficult to get specific information in the case of "organised crime."
"I checked and found that 11 BJP/RSS/Bajrang Dal workers were killed in their confrontation with Popular Front of India," Reddy said.
The rest were murdered due to personal reasons related to property dispute and old rivalry, he said.
"Those eight were indeed RSS members but the reasons were different," the minister added.
He said six PFI workers too lost their lives.
Reddy flayed the BJP for claiming that every Hindu murdered in Dakshina Kannada district were its workers.
Reddy wanted to know why the previous BJP government in Karnataka didnot ban the PFI.
Social Democratic Party of India (SDPI) is PFI's political wing.
In the case of Rao, Reddy said a detailed probe will reveal whether he and the accused had any political affiliation.
He said the case seems to be related to personal animosity over pasting of posters.
"Rao was videographing the putting up of posters, which the other group members wanted to be deleted. It is said he (Rao) refused," Reddy said.
"Weren't there murders happening during the previous BJP regime in Karnataka?," he asked.
In BJP ruled Haryana, 37 people were killed recently in clashes related to Baba Ram Rahim of Dera Sacha Sauda, he alleged.
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