The daughter of controversial US politician Sarah Palin has been involved in a mass brawl outside a party, according to reports.

Witnesses claimed 23-year-old Bristol Palin punched a homeowner several times outside a house in Anchorage, Alaska.

The claims came after police responded to a report of a fight among about 20 people outside a home on September 6.

Bristol Palin's brother Track was also in the thick of the brawl, witnesses said.

The claims emerged as police released a report on its investigation into the incident, including transcripts of interviews with multiple witnesses.

The report said no arrests were made at the time of the incident and no charges will be filed.

Alaska governor Ms Palin was the vice-presidential nominee for the Republicans in the 2008 presidential election.

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