Two men in their 20s have died after attending a day of separate music festivals in Sydney.

One man collapsed at the Knockout Festival at Sydney Olympic Park – later dying at Concord Hospital.

Another man who attended Listen Out at Centennial Park collapsed at nearby hotel and later died at St Vincent’s Hospital.

Police charged more than 70 people with drug offences at the two festivals.

Autopsies will be carried out to determine the cause of the men’s deaths.

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