ARLINGTON, Texas - (AP) - Storm surveyors are fanning across North Texas today trying to determine how many tornadoes touched down in the region yesterday, as people sift through the debris that used to be their homes.

The National Weather Service says possibly as many as a dozen twisters moved across the Dallas-Fort Worth area, bouncing in and out of neighborhoods, destroying homes at random. The Red Cross estimates that 650 homes were damaged in the Dallas suburb of Lancaster, one of the hardest hit areas.

There are reports of at least 20 injured across the region.

About 14,000 homes and business, mostly in the Arlington area, remain without power.

Officials at Dallas-Fort Worth International Airport and Dallas Love Field say hundreds of flights have been canceled.

April is usually the worst month in the March to June tornado season. Meteorologist Matt Bishop says "we're on pace to be above normal."