We're told by witnesses they were trying to keep themselves above water. A woman was able to pull one girl out, but the other girl didn't make it.
We're told that over the weekend, around 350 people had to be moved out of dangerous waters by lifeguards. And between Saturday and Sunday, lifeguards conducted 10 rescues.
Galveston officials say that if you're coming out to the beach, make sure you're swimming near a lifeguard.