Gov. Greg Abbott vowed Tuesday to continue rescue efforts in the flood-ravaged Hill Country “until every missing person is accounted for”.

Officials in Texas are facing mounting questions about whether they did enough to get people out of harm’s way before a flash flood swept down the Guadalupe River and killed more than 100 people, including at least 27 children and counselors at an all-girls Christian camp.

When deadly floods swept through Texas, the National Weather Service issued a series of warnings that should have automatically triggered alerts to be sent to cellphones as the Guadalupe River began to rise.

State and local officials in Texas have come under scrutiny over the lack of sirens in place to warn people of impending flash flooding.