Mexico's National Human Rights Commission says it has received a complaint from inmates at a maximum-security prison complaining of poor food and bad conditions.

A commission employee who was not authorized to be quoted by name said Thursday the complaint was received the previous day, but the commission is not allowed to discuss the details of complaints.

However, an online publication in Mexico has published excerpts from the complaint, including a facsimile suggesting it was signed by accused drug lords Joaquin "El Chapo" Guzman and Edgar Valdez Villarreal, alias "La Barbie."

According to the website Nayaritenlinea, the complaint alleges prisoners at Mexico's highest-security facility sleep in overcrowded conditions, are allowed outside less than an hour a day, and are served spoiled food.