Questions arose on both sides of the border about the decision to relocate convicted drug lord Joaquin “El Chapo” Guzman to a region that is one of his cartel’s strongholds, and a Mexican security official acknowledged that the sudden transfer was to a less-secure prison.

The official said that in general the Cefereso No. 9 prison on the outskirts of Ciudad Juarez, across from El Paso, Texas, is not as impregnable as the maximum-security Altiplano facility near Mexico City where he had been held. The official wasn’t authorized to discuss Guzman’s case publicly and agreed to do so only if not quoted by name.