Police said Tuesday night the message "Get ready west, on 101222 I'm killing" was circulating on Snapchat and Facebook.
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Officers from APD's Bureau of Neighborhood Policing spoke with witnesses who called 911, police said.
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Detectives from APD's Bureau of Investigations are working with West Aurora School District Administration to investigate the incident.
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Extra patrols were expected as an added security measure for students and staff.
Anyone with information on the incident is asked to contact detectives at 630-256-5500 or e-mail tips@aurora.il.us