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.

North Texas is sending relief to victims of historic and deadly flooding along the Rio Grande. Major Frankie Zuniga with the salvation army in McAllen says hundreds of residents were displaced from their homes due to the flooding.

According to the Associated Press, another death was reported in the Mexican state of Tamaulipas, located near the U.S.-Mexico border — bringing the death toll up to at least four. The extreme rainfall also pummeled parts of northeastern Mexico, with the region seeing between 7 and 12 inches of rain, according to AP.