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Parkland School District reopens with additional security following violent threat against middle school

Parkland schools reopen in-person amid threat investigation
Parkland schools reopen in-person amid threat investigation 00:29

ALLENTOWN, Pa. (CBS) -- After two days of disruption last week, a school district in Lehigh County has reopened. Students returned to classrooms in the Parkland School District on Monday with additional security stationed at the schools. 

The FBI and Pennsylvania State Police continue to investigate a violent threat against students and staff at Orfield Middle School.

Investigators say it came from an app the state created, Safe to Say Something. 

The district switched to virtual learning for two days last week due to the threat. 

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