(NewsNation) — Heavy rains caused a catastrophic flood emergency in Central Texas on Friday, leading to multiple confirmed fatalities and reports of at least 20 missing girls at a camp in the area.

The National Weather Service extended a flood watch for parts of southern Edwards Plateau and Hill Country through 7 p.m. CT Friday night.

In a press conference, authorities said there have been six to ten people found dead so far and that rescue operations are underway by air and ground to help find as many people as possible. The search effort includes 14 helicopters, nine rescue teams with swimmers and between 400 and 500 people on the ground.