"The San Isidro diocesan community, and especially the bishop and priests, publicly apologize to the young victims who were affected by the conduct of a priest within our diocese, Father Jose Mercau, when he was a priest at St. John the Baptist Church," said the document signed by Bishop Oscar Ojea and read at diocesan Masses Dec. 14-15.
The priest ran a group home for homeless and runaway youths and, in his 2005 trial, admitted he abused the boys.
The document said the "trauma that sexual abuse caused in the future of these children and young men cannot be measured. ... The conduct of the abuser also hurts Christ and undermines the community's confidence."
Local media have reported that the diocese is willing to pay reparation to the four youths and to do so may have to sell some church property.
Pope Francis has publicly spoken against abuses being committed by priests and has indicated his willingness to fight clergy sexual abuse.