The nephew of Miguel Angel Treviño Morales, reputed second-in-command of Mexico's Los Zetas drug cartel, was arrested this week, authorities in the northern state of Nuevo Leon said Friday.

Juan Francisco Treviño Chavez, 31, was detained Tuesday in suburban Monterrey along with cousin Jesus Chavez, a Zeta operative who escaped from prison in 2010, the state investigations agency said.

Two women accompanying the cousins were also arrested and all four detainees were turned over to the organized crime division of the Mexican Attorney General's Office.

Treviño Chavez is the son of Juan Francisco Treviño Morales, a convicted drug trafficker serving time in a U.S. prison.

Authorities said Treviño Chavez told interrogators that he and his cousin were sent to Nuevo Leon to bolster the Zetas' presence in the state, which borders Texas.

Another of the Treviño Morales brothers was apprehended this week in Oklahoma on charges that he was using his successful horse-breeding business in the U.S. Southwest to launder money for Los Zetas.

Los Zetas, a group founded by deserters from a U.S.-trained Mexican special forces unit, started out as the armed wing of the Gulf cartel, but the two criminal organizations had a falling out in 2010 and the Zetas went into the drug business on their own account, gaining control of several lucrative territories.

Even in the violent world of Mexican organized crime, the Zetas stand out for their propensity to dismember the bodies of their victims. EFE