Here are the latest developments about Mexican drug lord Joanquin 'El Chapo' Guzman's escape from prison:

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8 a.m.

Mexico's top security official says top drug lord Joaquin "El Chapo" Guzman has escaped through a 1.5-kilometer (1 mile) tunnel that opened into the shower area of his cell.

Security Commissioner Monte Alejandro Rubido tells a news conference Sunday that Guzman used an elaborate escape hatch built allegedly without the detection of authorities.

With his escape Guzman has done what Mexican authorities promised would not happen after his re-capture last year — to slip out of a maximum security prison for the second time.

Rubido says 18 employees from various part of the Altiplano prison 90 kilometers (56 miles) west of Mexico City have been taken in for questioning.