At least three people died in a South Texas county after around 20 inches of rain fell on the Rio Grande Valley, causing what the state agriculture commissioner called catastrophic flooding.

More than 3,400 in several counties in South Texas remained without power on Friday afternoon, according to AEP Texas. A flood warning was still in effect for portions of South Texas, including Cameron, Hidalgo and Willacy counties, through early Friday afternoon, according to the National Weather Service.

Texas Governor Greg Abbott has issued a disaster declaration for the Rio Grande Valley following Thursday’s heavy rainfall and flooding. On Saturday, Gov. Abbott announced his declaration for Cameron Hidalgo,