MINNEAPOLIS (AP) — The state of Minnesota on Friday shut down a metal recycling company where a fire burned for days and sent up plumes of smoke.

The state cited “imminent and substantial danger” to the public, the Star Tribune reported. The Minnesota Pollution Control Agency issued an administrative order prohibiting Northern MetalRecyclingfrom accepting any scrap metal at its plant in Becker, site of the fire. The order also prohibits the company from accepting scrap metal at its previous facility in north Minneapolis, where it still has many junked cars stored.

On Friday, Gov. Tim Walz said he is considering placing a 30-dayhold on Northern Metal’s recycling permit. Speaking at a forum organized by the University of Minnesota’s Humphrey School of Public Affairs, Walz said he is looking at ways to hold Northern Metal responsible for pollution caused by this week’s fire at its plant in Becker, in central Minnesota.

Walz told the audience that he does not trust Northern Metal “to do the right thing,” KMSP-TV reported. The Democratic governor said state regulators would make the decision on a 30-day hold.

On Feb. 11, a week before the Becker fire erupted, fire inspectors cited Northern Metal’s former facility in north Minneapolis for a variety of code violations related to its outdoor storage practices, the Star Tribune reported, citing inspection records.

The Becker Police Department reported in a Facebook post that initial air tests have found no hazardous chemicals. The Minnesota Pollution Control Agency took additional air samples Thursday; results released Friday found nothing unusual in the types and levels of volatile organic compounds that are released in gases. Air sampling also did not detect metals, the agency said. Additional monitors set up Friday for particulate matter found nothing that raised concern, with levels similar to those in the Minneapolis-St. Paul area.