Chicago police reported a shooting inside Guaranteed Rate Field during Friday night’s White Sox game and said more information would be forthcoming.

A police spokesman on social media said a briefing would take place regarding the “shooting incident,” but later said a written update would be circulated overnight. It was not immediately clear how many people were injured.

A spectator, Greg Mika, said he was seated in the left center field about four rows behind a young woman who received medical treatment to her leg below the knee and watched her walk away while speaking with medics.

The incident had occurred by the game’s third inning, he said, but most spectators were only asked to evacuate at the conclusion of the game. He said authorities did clear out several rows in front of and also behind where the woman had been seated.

Mika, of the southwest suburbs, and his friends were unclear what happened to the woman. Despite speculation that she may have been injured from a bullet, Mika said his sense of safety at the game was not shaken. ”No, no really,” he said, “because we’re not really sure what happened. We’re just hearing speculation…”

A postgame concert was canceled according to multiple reports. “Due to technical issues, tonight’s postgame concert has been canceled,” was displayed on the stadium’s video scoreboard.

The Sox lost to the Oakland A’s 12-4.

This is a developing story. Check back for updates.

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