State and federal authorities have responded to an industrial chemical manufacturing facility as part of what a Virginia official says is a criminal environmental investigation.

AdvanSix said in a statement that authorities were at the company's plant in Hopewell Tuesday to execute a search warrant. Spokeswoman Debra Lewis says the company is 'still learning' about the investigation and she can't provide further details.

Ann Regn is a spokeswoman for Virginia's Department of Environmental Quality. She says the agency is taking part in a criminal environmental investigation led by the Environmental Protection Agency.

An EPA spokeswoman confirmed it had employees at the site but declined further comment.

According to AdvanSix's website, the plant southeast of Richmond is one of the world's largest single-site producers of a chemical used to make packaging, plastics and fibers.