At least 70 people are dead in central Texas after devastating flash floods slammed Texas Hill Country, with water rescues taking place along the Guadalupe River, which rose rapidly early Friday morning to the height of a two-story building.

Here’s what to know about the deadly flooding, the colossal weather system that drove it in, and around Kerr County, Texas, and ongoing efforts to identify victims.

Gov. Greg Abbott said there are at least 68 people dead in Kerr County, including 40 adults and 28 kids, after flooding hit central Texas. Ten children from Camp Mystic and one counselor are still unaccounted for.