The Zetas appear to be losing ground against Mexican governmental groups:
Mr. Lazcano deserted more than a decade ago from an elite Mexican Army unit. Along with other former special forces operatives from Mexico and Guatemala, he founded, trained and recruited armed men to serve as enforcers for the powerful Gulf Cartel.
The Zetas split off on their own two years ago and have fought their former allies and the Sinaloa Cartel, run by the drug lord Joaquín Guzmán, known as El Chapo, or Shorty, who is wanted as badly here as Osama bin Laden once was by the United States.
Lately, security analysts have reported that the Zetas themselves are fracturing into at least two groups, and Mr. Lazcano’s death, along with the recent captures of other top Zeta leaders, will probably sow even more confusion and violence among the ranks. In the scramble, Zeta leaders are believed to be turning on one another through executions and providing tips to law enforcement. Another Mexican Navy operation against the Zetas on Sunday, in Nuevo Laredo, led to the capture of a man whom the authorities said was the gang’s regional leader in three border states.