Firefighters in the US state of Texas are battling to contain wildfires which have burned more than one million acres in the past fortnight. Officials said fires were burning from border to border, with some covering more than 100,000 acres. Several towns have been evacuated and flames are now close to Fort Worth, one of the state's largest cities. The Texas Fire Service said it had responded to 11 new fires yesterday, in addition to the scores already burning across the state. Nearly 200 homes are reported to have been destroyed. Planes have been dropping water and fire retardant on the burning areas while firefighters have been dousing threatened homes. Weather forecasters say there is a 30 per cent chance of rain in the region today and tomorrow, which could ease conditions. Texas Governor Rick Perry has asked President Barack Obama to issue a Major Disaster Declaration for the state in the face of the fires.