LAUREL, Miss. (AP) — Federal immigration agents said they rounded up 350 suspected undocumented workers in a raid on a Mississippi electrical equipment plant Monday, after sealing all entrances and questioning employees.

Barbara Gonzalez, a U.S. Immigration and Customs Enforcement spokeswoman, confirmed the raid at Howard Industries Inc. of Laurel. Suspected illegal workers were loaded into white vans with shaded windows and driven away. Gonzalez wouldn't say where they were headed other than to say they were being taken to a holding facility.