At least 104 people are dead after heavy rain led to devastating flooding in Texas. Kerr County was hit the hardest, with at least 87 deaths, including 30 children. President Donald Trump signed a disaster declaration for the county and the Federal Emergency Management Agency is on the ground there.

As of Monday, officials report that at least 81 people have lost their lives due to the flash floods that swept through Central Texas. Among the victims are at least 28 children from Kerr County. With people still unaccounted for,

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.