After searching for a possible bomb, the all clear was given for workers and employees to return to business as usual at Tyson Foods late Wednesday morning.

Center Police say the plant on Shelbyville Street was evacuated after a 911 call was received around 8:30 a.m. After the property was checked, including a check of all equipment by the plant's safety squad, the all clear was given.

The unknown caller, who called on a pre-paid cell phone, said the bomb would go off at 9.

It's reported the investigation has been turned over to Texas Rangers and the FBI.