Four young men shot to death execution-style in a San Bruno apartment died at the hands of a gang of men with links to one of Mexico's most ruthless drug cartels, according to prosecutors trying to paint a picture yesterday of the depth of crimes the gang was involved in.

Alfredo Valenzuela, 23, one of the suspects in the gruesome Jan. 11, 2002 quadruple murders, reportedly admitted being a member of the Tijuana-based Arellano-Felix cartel. The cartel has moved billions of dollars worth of drugs into the United States and takes responsibility for many vicious murders including those of DEA agents. Published reports say the cartel was the subject of the film "Traffic."

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