ST. JOSEPH, Mo. (AP) -- A massive blast at a production plant in St. Joseph rocked part of the city but initial reports were that everyone at the plant escaped injury.

KQTV reports that the explosion at the AG Processing Inc. plant occurred around 3:20 a.m. Friday on the city's south side and was felt by residents miles away.

First responders say about 25 to 30 employees were working during the explosion, but the blast occurred outside the plant. Emergency crews evacuated nearby businesses.

Firefighters contained a small fire to the hydrogen portion of the plant and the fire appeared to be under control by 6 a.m.

AG Processing is a farmer-owned cooperative that processes grain into several products from food to renewable fuels.