A fire at a chemical plant in Texas in the United States is out, according to local news reports.Smoke could be seen extending kilometers away from the El Dorado Chemical Company, in the city of Bryan, north of Houston, after the blaze broke out around noon on Thursday. Thousands of residents were evacuated. The plant processes fertilizer and other chemicals including ammonium nitrate, which can be explosive. There were no reported casualties but the health authorities said close to a dozen people were treated for respiratory problems. A local television station said residents living more than three kilometers away from the factory can now return home.