ROME — The Vatican criminal tribunal agreed Tuesday to broaden a sex abuse trial involving the Holy See’s youth seminary beyond two priests already charged to include the religious organization responsible for running the residence.

The lawyer for the alleged victim argued in court that there was evidence of “gross negligence” and “lack of vigilance” in running the St. Pius X seminary that resulted in his client being abused when he was a young altar boy.

The seminary, located in a palazzo inside the Vatican gardens, houses boys aged 12-18 who serve as altar boys at papal Masses in St. Peter’s Basilica. One of the former altar boys says he was repeatedly molested by an older seminarian while living there.

Attorney Dario Imparato asked the court to also charge the seminary itself and the Opera Don Folchi association of priests that runs it, as well as the diocese of Como, which is responsible for both.

After consulting behind closed doors with other judges, Tribunal President Giuseppe Pignatone said the court agreed to prosecute the seminary and Opera Don Folchi, though it rejected the request to bring the Como diocese into the case.

The development substantially broadens the first-ever criminal trial in the Vatican concerning allegations of sexual abuse that occurred on Vatican soil. According to the original indictment, Father Gabriele Martinelli, 28, is accused of abusing his authority as a more senior seminarian to force a younger seminarian into “carnal acts” of sodomy and masturbation, using violence and threats, from 2007-2012.

The former seminary rector, Father Enrico Radice, is charged with having helped Martinelli avoid investigators by discrediting the victim’s allegations as baseless.

The scandal is particularly grave because the abuse allegedly occurred within Vatican City itself, and the allegations were known since at least 2012 but were covered up by the Vatican and other church authorities until the victim and his roommate, Kamil Jarzembowski, went public in 2017.

After that, Pope Francis waived the statute of limitations in the case and signed off on a new policy for Vatican City requiring such crimes to be reported to Vatican prosecutors.

Neither Martinelli nor Radice have responded publicly to the allegations. They were in court on Tuesday and were supposed to have been questioned, but the hearing was taken up with the question of whether to broaden the trial.

The Opera Don Folchi has lashed out at the allegations against Martinelli and its seminary as “mud,” a “violent attack on the church” and nothing more than “calumny and falsifications.”

The next hearing was set for Nov. 19.