ST. LOUIS, MO (KTVI) — Hundreds of people were evacuated after a mobile meth lab was found at the Walmart on Telegraph in South County.

Police confirm that sometime around 6:30 p.m. Thursday a shoplifter was picked up inside the store. That shoplifter was carrying something unusual, something that can best be described as a portable meth lab.

Of course the chemicals involved in making meth are highly toxic and explosive. Reason enough to clear hundreds from the store.

Customers were told there's a threat and that the store needed to be evacuated. Employees are turning cars around in the parking lot.

No one is saying when the store will reopen.