12 Missing in Hays County, Texas

(CNN) -Record-setting rains left officials in Texas and Oklahoma scrambling to assess the scope of the damage and destruction in the area Monday, as an emergency coordinator told reporters that a dozen people were missing in one county.

The 12 people missing in Hays County, Texas, come from families that had gathered for the long weekend, said, Ken Bell, Emergency coordinator for San Marcos, one of the cities hardest hit by the storms and flooding.

The group likely includes children, Bell said.

A day after the severe weather left three people dead and washed away hundreds of homes in Texas and Oklahoma, the heavens are easing up. But that doesn't mean the threat is gone.

The torrents that those storms dumped are still too much for river and creek banks to contain, and runoff was still peaking early Monday, threatening continued flooding, the National Weather Service warned.