Nevertheless, according to the newspapers "The Brownsville Herald" and "The Monitor" from across the border in Brownsville, Texas and McAllen, Texas, around 50 people were killed in the gunfights. Although not confirmed, "KVEO-TV", several online sources and witnesses, along with one law enforcement officer who preferred to keep his name anonymous, mentioned that more than 100 people died that day in Matamoros. The death of Antonio Cárdenas Guillen also caused a spiral of violence in Reynosa, Tamaulipas a number of days after he was killed. Moreover, his death also generated a turf war with Los Zetas in the city of Ciudad Mier, Tamaulipas, resulting in the exodus of more than 95% of its population. Banners written by Los Zetas, the Gulf Cartel's former armed wing, appeared all across Mexico, celebrating the death of Cárdenas Guillén. United States President, Barack Obama, called the President of Mexico, Felipe Calderón, congratulating him and the Mexican forces for the operation in Matamoros, and reiterated his effort against organized crime.