TERRELL -- Terrell ISD students will be held at their campuses until further notice Tuesday afternoon as authorities search for an 'agitated individual' who 'may be headed to the Terrell area,' according to the district's Facebook page.

A district spokesperson confirmed the individual is a former district employee.

TISD said law enforcement is attempting to find the individual, and until they do, all bus riders, student walkers, and students who drive to and from school will be held at school in an external lockdown.

Parents and guardians are welcome to come into the school and personally pick up their child.

'[T]his is a precautionary measure and no incident has occurred,' the page said. 'All students and staff are safe.'

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