Police detained O.J. Simpson on charges related to an armed robbery involving sport memorabilia.
Simpson was arrested shortly after 11 a.m. and is being brought to a police office, Capt. James Dillon said.
Simpson has said he and other people with him went to the Palace Station casino-hotel on Thursday to retrieve items that belonged to him. He told police no guns were involved.
Police said earlier Sunday that two firearms and other evidence had been seized during the investigation after a search of a private residence. At least one other person has been arrested.
The remarks from the Pope came as "a very strong step towards degradation," "given the rather massive nature of homosexuality" among the Catholic clergy.