CARACAS, Venezuela (AFP) — Inmates at a Venezuelan prison have been captured on video firing a host of automatic rifles and other guns into the air at a memorial service for their late leader.

The incident drew condemnation Tuesday in the Opposition-controlled legislature and from an activist group that monitors prison violence, which demanded an explanation of how jailed criminals could have gained access to such an arsenal.

The video, obtained by prison monitoring group Window on Freedom, shows dozens of inmates gathered on the roof of a prison on Margarita island, which sits in the Caribbean about 40 kilometers (25 miles) off the Venezuelan mainland.

At least four inmates can be seen firing large automatic rifles into the air, and four others firing automatic pistols. Some of them pause to reload and then continue their spree.

Carlos Nieto, spokesman for Window on Freedom, said the incident took place Monday at a memorial service for a former prisoner named Teofilo “Rabbit” Rodriguez, who had for years been the boss among the inmate population.

Rodriguez, a convicted drug trafficker whose decade-long jail term ended a year ago, was shot dead at a bar on the island Sunday, Nieto said.

“Rabbit’s body was taken to the prison. That’s when the gunfire occurred,” he told AFP.

The group said Rodriguez’s family and friends had brought his body to the jail with the complicity of prison authorities. It called for Prison Services Minister Iris Varela to resign.

In the video, more than a dozen National Guard members can be seen reacting with surprise to the gunfire, then going about their business.

“It’s incredible that this can happen with total impunity. What can ordinary citizens expect if the people locked up in jail have these kinds of guns and run a large part of the country’s organized crime?” said legislative majority leader Julio Borges, an opponent of President Nicolas Maduro.

Venezuela has one of the world’s highest murder rates, and violent crime, along with a widening economic crisis, fueled the opposition’s landmark win in legislative elections last month.

Borges proposed creating a legislative commission to investigate the state of Venezuela’s overcrowded prisons. Window on Freedom says they hold some 55,000 inmates, though they have a maximum capacity of 19,000.