A jury has ruled that 10 former residents of Times Beach, a town destroyed by toxic waste contamination, had not been harmed by contact with dioxin-laced oil used to spray roads in the early 1970s.

The Circuit Court jury deliberated a day before returning a verdict Tuesday in favor of Independent Petrochemical Corp. of St. Louis and the now-defunct Northeastern Pharmaceutical and Chemical Co. of Verona.

The companies, along with Syntex USA and Syntex Agribusiness of Palo Alto, Calif., had been sued by former Times Beach residents in an attempt to recover damages for health problems they said were caused by their exposure to dioxin.