BBC News, 9/27/12
Police say Ivan Velazquez Caballero, known both as El Taliban and as Z-50, is a commander of the violent criminal network, the Zetas.
However, the identity of the man in custody has yet to be confirmed.
The arrest in the city of San Luis Potosi comes days after it was reported that Velazquez had split from the Zetas and joined the rival Gulf Cartel.
