The warden of Bolivia's main prison has been fired and placed under investigation after inmates threw a noisy birthday bash for the country's jailed former anti-drug chief.

State attorney Pablo Guzman said Thursday that Col. Johnny Rojas was dismissed and is suspected of granting another prisoner's request to hold the party behind bars for the ex-drug czar, Gen. Oscar Nina.

Neighbors complained about loud music from the October party, which reportedly included a show with singers in the main patio at Palmasola penitentiary. Bolivia's largest prison houses more than 4,000 inmates outside Santa Cruz, about 335 miles (540 kilometers) east of the capital of La Paz.

Nina's attorney says his client did not promote the party.

Bolivia's former top drug cop was arrested and jailed in March along with his son, also a police official, on suspicion of illicit enrichment and ties to narcotics trafficking.

Authorities believe father and son helped Jesus Guzman, the son of Mexican drug lord Joaquin "El Chapo" Guzman, enter Bolivia in 2011 under a fake identity so he could learn how to pilot small planes near Santa Cruz. The city is considered to be the base of operations for transporting Bolivian and Peruvian cocaine by air and land to Brazil and Argentina.

Government Minister Carlos Romero said parties of a "recreational and cultural" nature are permitted at the prison, "but they don't usually take place at 11 at night."