The Burlington Police Department received a call at approximately 9:30 a.m. that said there was an active shooter inside Walter M. Williams High School in Burlington, according to public information officer Emily-Lynn Adkins. 

A Dec. 1 press release said once on campus, responding officers — in tandem with two on-duty school resource officers, who were already on site — determined that there was no evidence that supported an active threat to the campus, students and staff. 

A tweet from the Alamance-Burlington School System at 10:39 a.m. said the department placed the school on lockdown.

The 911 call was deemed a false report and a 10:57 a.m. tweet announced the lift of the lockdown. 

The investigation is ongoing and the press release said detectives are still working to gather information regarding the false call. 

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Sophie Rosenthal contributed to the reporting of this story.