Two top executives at one of Australia's biggest childcare chains have resigned following a string of scandals, including dozens of sex abuse charges being laid against a former employee.

Affinity Education Group said chief executive Tim Hickey and chief operating officer Nishad Alani had stepped down from their roles and left the organisation, which runs 250 centres across Australia under brands including Papilio, Kids Academy and Milestones.

In July, Melbourne man Joshua Dale Brown, who worked at centres including ones run by Affinity, was charged with more than 70 offences, including the alleged sexual abuse of eight children as well as the transmission of child abuse material.

Mr Brown's lawyers said they expected further charges to be laid against the 26-year-old. He has not entere

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