Although Kerr County was hit hardest by flooding, at least seven others have been confirmed dead in different parts of Texas. About 150 miles east of Camp Mystic, Travis County has confirmed at least four deaths, county spokesperson Hector Nieto told CBS News by phone Saturday night. Travis County includes the Texas capital city of Austin.

Forecasts of continued heavy rain and thunderstorms are raising concerns, as rising water levels could further hamper rescue efforts, officials say.

Eleven girls from a summer camp along the Guadalupe River in the Texas Hill Country are among those unaccounted for. Forecasters warned of more rain and possible flash flooding in hard-hit areas on Sunday.