MINNEAPOLIS — The Roman Catholic archbishop of St. Paul and Minneapolis said Wednesday that he has opened an investigation — the first known of its kind under a new Vatican protocol — into allegations that a bishop in northwestern Minnesota interfered with investigations into clerical sexual misconduct.

Archbishop Bernard Hebda said in a statement posted on the archdiocese’s website that the investigation targets Bishop Michael Hoeppner of the Crookston diocese. Hebda said the allegations are that Hoeppner “carried out acts or omissions intended to interfere with or avoid civil or canonical investigations of clerical sexual misconduct in the Diocese of Crookston,” but he gave no further details. He said law enforcement has been informed.

Advocates for clergy abuse victims say it’s the first known investigation by one bishop into another under a groundbreaking church law issued by Pope Francis in May aimed at holding the Catholic hierarchy accountable for failing to protect their flocks. Among other things, it outlines procedures for conducting preliminary investigations of bishops accused of sexual misconduct or cover-ups.

Jeff Anderson, a St. Paul attorney who has represented hundreds of survivors of clerical sexual abuse, told The Associated Press that the allegations against Hoeppner likely stem from lawsuits against the Crookston diocese that have been settled, including one by Ron Vasek, who was aspiring to be a deacon when, he alleged, Hoeppner blackmailed him into signing a letter in 2015 that essentially retracted his allegation that a popular priest had abused him when he was 16.