A delegation of opposition leaders, which included TPCC president N Uttam Kumar Reddy, state BJP chief K Laxman and TDP's Telangana unit head L Ramana, met the Governor and submitted a memorandum in this regard.
The incident relates to arrest of eight persons last month at Nerella in the district for allegedly torching a sand -laden truck, which was involved in a road accident, causing the death of a person.
The Congress, BJP and other parties and outfits had alleged the accused were "tortured" while in police custody and subjected to "third degree methods".
The top leaders of ruling TRS are related to the "sand mafia" (allegedly involved in irregularities in sand sales) in the district, the opposition parties claimed in the memorandum submitted to the Governor.
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"At the behest of sand mafia contractors... Dalits and BCs were subjected to the worst form of police brutality and third degree torture by Sircilla police," they said.
Alleging that the police "tortured" the accused, state BJP president Laxman said the suspension of a sub-inspector for the incident was not enough.
Congress' Reddy said the opposition parties would meet President Ram Nath Kovind later this month.
The opposition leaders urged the Governor to institute an independent inquiry into the incident and also take action against police officials who indulged in "torture".