Tens of thousands of Rohingya -- a group loathed by many among Myanmar's Buddhist majority -- have fled a military operation in the northwestern state, launched after deadly attacks on police posts in October.
Dozens have died in the crackdown, while escapees now in neighbouring Bangladesh have claimed they suffered rape, arson, murder and torture at the hands of police or soldiers.
Myanmar's government, led by Nobel laureate Aung San Suu Kyi, has said the allegations are invented and has resisted mounting international pressure to protect the minority.
Its interim findings come days after the government detained multiple police officers over a video showing policemen beating and kicking Rohingya villagers.
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The footage, shot by one of officers, has sparked outrage and undermined the government's blanket denials that soldiers and police have carried out rights abuses.
The size of the "Bengali" population, mosques and religious buildings in the unrest-hit area "are proof that there were no cases of genocide and religious persecution", it said in a statement carried in state media.
The commission also found "insufficient evidence" of rape but added it was still looking into claims security forces committed arson, illegal arrests and torture of the Rohingya.
It blamed the unrest on foreign-backed extremists, whom it said had attacked security forces in October to harm "the sovereignty of the state... With the intention of igniting riots and conflicts".
Legal action has been taken against 485 people arrested during the army's subsequent clearance operation, it added, without giving further details.
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