Assault weapons lost under the Fast and Furious gun surveillance program have been found in the Mexican home of the alleged leader of a massive drug cartel, according to The Los Angeles Times.

Forty high-powered assault weapons were found in the Ciudad Juarez home of Jose Antonio Torres Marrufo, a "feared" leader of the Sinaloa drug cartel in that city, according to the Times. The Sinaloa cartel is considered the most powerful drug trafficking organization in the world.

"These Fast and Furious guns were going to Sinaloans, and they are killing everyone down there," one knowledgeable US government source told the Times.

The guns were part of a stash of weapons that went missing in Operation Fast and Furious, which was initiated in October 2009. Under the program, federal agents from the Bureau of Alcohol, Tobacco, Firearms and Explosives encouraged gun stores throughout the southwestern US to sell weapons to known and suspected straw buyers in the hopes of tracking them to Mexican drug cartels.

Instead, more than 2,000 weapons were trafficked along the US-Mexico border, many to the Sinaloa cartel, and some guns were used in violent crimes in Mexico.

The House Oversight and Government Affairs Committee is planning to subpoena Attorney General Eric Holder this week to determine who in the Justice Department knew about the program and the missing guns, FOXNews.com reported Sunday. Holder maintains he knew nothing of the botched program until April.

Mexican police found the guns in Torres Marrufo's home in April 2011, but the suspected cartel member was not home at the time.

Torres Marrufo, who has eluded capture, has been indicted in El Paso. He is alleged to be the enforcer for Sinaloa cartel chief Joaquin "Chapo" Guzman.