CAMBRIA, Wis. — Rescue crews were scouring the rubble of a corn mill plant for two employees following an explosion that killed at least one person and injured about a dozen others in southern Wisconsin, authorities said today.

Columbia County Sheriff Dennis Richards said during a news conference that 16 employees were working at the time of the blast at the Didion Milling Plant in Cambria, a small community about 45 miles northeast of Madison. The plant processes corn for ethanol.

Dozens of police, fire and rescue agencies responded after the explosion was reported around 11 p.m. Wednesday. No information has been released about what may have caused the blast.

An official said the fire was contained by early today, but the building was destroyed. There were no evacuations in the area.

Schools in the Cambria-Friesland district closed because of the incident in Cambria.