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Basketball Australia announced on Monday that it had opened an investigation into an altercation involving Liz Cambage during the team’s exhibition match against Nigeria.

“The circumstances surrounding the incident that occurred during the scrimmage between Nigeria and Australia involving Liz Cambage are currently under investigation for a breach of the integrity framework and code of conduct,” Basketball Australia confirmed.

The Opals star withdrew from the Olympics after appearing courtside at the WNBA All-Star game on Wednesday, citing her mental health.

“Every athlete competing in the Olympic games should be at their mental and physical peak,” Cambage wrote via social media. “At the moment, I’m a long way from where I want and need to be.”

Australia will begin its Olympic campaign with the team’s first group-stage match against Belgium on July 27.