Texas’ junior senator was visiting Greece Friday when the Texas flood turned deadly. Cruz, who did not return until Sunday night, communicated with officials from Athens.

Hours before a massive wall of floodwater barreled down a river in the heart of Texas Hill Country before sunrise on Friday, forecasters with the National Weather Service warned people that dangerous conditions were brewing.

Search efforts continue for the dozens of people still missing after Friday's floods, as questions swirl over what went wrong. Here's what we know so far.