Search and rescue efforts continued overnight in Texas for the dozens of people still missing from the devastating flash floods that have killed more than 100 people. Meanwhile, the Texas flood alert system is facing scrutiny over how much warning locals were given ahead of the flash floods.

In the early hours of July 4, the only sound many of the vacationers along the banks of the Guadalupe River would have heard was pounding rain and thunder. They didn’t get any official warning of the rapidly rising waters that ultimately proved deadly to dozens of people swept away in central Texas flash floods.