additional rifles. Congressional investigators have stated that Osorio was known by the ATF to be a straw purchaser months before he purchased the gun used to kill Zapata, leading them to question the Bureau's Operation Fast and Furious leading to the illegal purchase and export of the murder weapon. Mexican functionaries mentioned that although their efforts have been significant, without full cooperation from the United States in preventing the drug consumption in the U.S., the flow of American weapons and of cash south of the border into the hands of the Mexican criminals, there will not be any significant improvement in dismantling the drug cartels. On another note, the slaying of Zapata has sparked a debate on whether U.S. agents in Mexico should be allowed to carry guns to defend themselves. President Felipe Calderón mentioned during his visit to Washington, D.C. on March 3, 2011 that "alternatives" would be examined with Congress to improve the security of U.S. agents working in Mexico. Aftermath The death of Jaime Zapata allowed for the United States to work closely with officials on the Mexican-led investigation to ensure the perpetrators were captured as quickly as possible. Throughout the investigation, all the killers were eventually captured, including Jesús Enrique Rejón Aguilar, the third most powerful leader in Los Zetas and boss of the state where Zapata was killed. As tribute to Zapata, an avenue in Brownsville was renamed after him. Reactions Barack Obama: "The United States will work with Mexico to bring the assailants to justice." Janet Napolitano: "Let me be clear: Any act of violence against our ICE personnel — or any DHS personnel — is an attack against all those who serve our nation and put their lives at risk for our safety." Michael McCaul: "The United States will not tolerate acts of violence against its citizens or law enforcement and I believe we must respond forcefully." Pat Ahumada: "I am angered by this and frustrated that the Mexican government is not providing security to our agents while we are trying to help them. Criminals have the firepower in Mexico." Felipe Calderón: "His death must urge us to work together to ensure a prosperous and peaceful future for our region." "One of those weapons [of Operation Fast and Furious] was the one that killed officer Zapata, an American agent in Mexico... the American agencies should stop the criminal flow of arms into Mexico."