Vatican City: Two members of a commission Pope Francis set up to study reforms, including a high-ranking Holy See official, have been arrested on suspicion of leaking confidential documents, the Vatican said on Monday.

It was one of the biggest internal scandals to hit Francis’ papacy so far and was reminiscent of the ‘Vatileaks’ furore that preceded the resignation of former Pope Benedict in 2013.

Spanish Monsignor Lucio Angel Vallejo Balda, number two at the Vatican’s Prefecture for Economic Affairs, and Italian laywoman Francesca Chaouqui, a public relations expert, were arrested over the weekend, a Vatican statement said.

Vallejo Balda, 54, was believed to be the highest-ranking member of the Vatican’s central bureaucracy, known as the Curia, ever to have been arrested. Chaouqui, 33, was released on Monday after she agreed to cooperate with the investigation, it said. The Vatican said the leaks represented a “serious betrayal of the trust bestowed by the pope,” without providing any details.

There was no immediate comment from Vallejo Balda and Chaouqui, or their lawyers.

(Inputs from Reuters)