Several members of Pope Francis' sex abuse advisory board are expressing concern and incredulity over his decision to appoint a Chilean bishop to a diocese despite allegations that he covered up for Chile's most notorious pedophile.

In interviews and emails with The Associated Press, the experts have questioned Francis' pledge to hold bishops accountable and keep children safe, given the record of Bishop Juan Barros in the case of the Rev. Fernando Karadima.

The five members spoke to the AP in their personal and professional capacity and stressed that they were not speaking on behalf of the commission, which Francis formed in late 2013 and named Boston Cardinal Sean O'Malley to head.

"I am very worried," said commission member Dr. Catherine Bonnet, a French child psychiatrist.