DES MOINES, Iowa (AP) -- Des Moines city officials say residents are complaining about a putrid smell that forced patio diners at one restaurant to move indoors.

The Des Moines Register says the stench was traced to an animal rendering plant less than a mile southeast of the downtown. City officials say they received 14 calls Monday night, enough to trigger the city's first odor inspection in 10 years.

Bruce Gerleman, who owns a downtown seafood restaurant, describes the odor as a "putrid, dead animal smell."

He says dignitaries dining at his restaurant after a World Food Prize ceremony complained about the smell Monday night. He says patio diners at Jethro's BBQ, another restaurant he owns, were so offended that they moved indoors.

Inspectors traced the smell to Darling International, which processes animal byproducts.