There are more than 100 emergency personnel on the ground working to reunite families, the sheriff said. A large-scale search and rescue effort is ongoing.

Nearly a decade ago, neighboring counties, Guadalupe and Comal, installed flood sirens. Nearby New Braunfels regularly tests its outdoor warning system, which is designed to alert residents to flash floods that are common in the area. But in Kerr County, officials admitted over the weekend that no such system exists.

Texas Gov. Greg Abbott planned to make another visit Tuesday to Camp Mystic, the century-old all-girls Christian summer camp where at least 27 campers