At least 70 people, including at least 21 children, have died as a result of flash flooding in Texas after the Guadalupe River north of San Antonio flowed over its banks. The search for victims intensified June 6, as 11 children and a camp counselor remain missing from Camp Mystic, a Christian girls' camp at the river's edge.

The death toll in Texas’ catastrophic floods has climbed to 70 people across six counties. At least 11 girls remain missing from Camp Mystic, a summer camp on the banks of the Guadalupe River. NBC News' Ryan Chandler reports.