The lockdown at Sullivan Middle School was lifted at 10:53 a.m. Wednesday.
The school was placed on a preventative lockdown early Wednesday while Rock Hill police search for a suspect in the area, according to a tweet from the Rock Hill school district.
Police were searching for a suspect or suspects involved in a strong armed robbery at Cherry Park, said Rock Hill officer Paul Myers. No one was injured, he said.
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Myers said an arrest was made, but he could not identify the suspect or supsects Wednesday afternoon.
Check back for updates.