"The accused is being detained in a cell in the barracks of the Gendarmerie Corps, available to the judicial authorities", a Vatican statement said.
The Vatican said April 9 that Mgr Capella was taken into custody that morning by the Vatican gendarmes at the request of Vatican City State's promoter of justice, who serves as chief prosecutor and directs criminal investigations.
The Vatican has arrested Msgr.
The case is the latest blow to the Catholic Church as it struggles to overcome repeated sex abuse scandals among its clergy.
The Vatican on Saturday arrested a diplomat recalled from Washington previous year amid investigations in Canada, the United States and the Vatican for possession of child pornography. His arrest comes after an eight-month investigation by the Holy See, which was first informed of a potential problem by the US State Department past year.
The United States made "an official request" for the man's diplomatic immunity to be lifted but the Vatican refused, said a U.S. official on condition of anonymity.
The pontiff has declared zero tolerance for the abuse that has plagued the Church for decades, but critics say he has not done enough, particularly in holding bishops responsible for mishandling or covering up misconduct. He had worked since the summer of 2016 at the Vatican nunciature in Washington.
After Capella was recalled to Rome, police in Windsor, Canada said they had issued an arrest warrant for him on suspicion of possessing and distributing child pornography on the internet.
In 2015, Jozef Wesolowski, a former archbishop and the Holy See's former ambassador to the Dominican Republic, died of a heart attack while awaiting his Vatican trial for sexual abuse of minors and possession of child pornography.
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