Hovering above the debris-strewn Guadalupe River, drone pilot Jordy Marks scans the flood-ravaged landscape with a quiet determination. As part of a civilian search and rescue team, Marks is helping guide ground crews to areas still untouched nearly a week after deadly floodwaters swept through Central Texas.

Texas Gov. Greg Abbott on Wednesday ordered state legislators to convene a special session on Monday as the death toll rose to at least 120 people and 172 reported missing in Fourth of July flooding in the Hill Country.