RAW VIDEO: 'El Chapo' escapes from prison cell; officials believe he had inside help

ALMOLOYA, Mexico (AP) — Mexico's interior secretary says Joaquin Guzman must have had inside help to escape from a maximum security prison west of Mexico City last weekend.

As authorities hunt for any sign of Mexico's most powerful drug lord, security experts said the elaborately designed tunnel he used makes it clear that "El Chapo's" escape involved help on a grand scale. A former member of Mexico's domestic intelligence service, Alejandra Hope, notes in a blog that the tunnel was a mile-long, "wide enough to hold a motorcycle, and ending in one of the few blind spots in Mexico's most-secure prison."

Interior Secretary Miguel Angel Osorio Chong adds that the tunnel builders would have needed the blueprints to reach Guzman's cell.

Some 32 prison employees, including the prison director are being questioned.

U.S. officials say the tunnel must have been in the works for at least a year.