sentence1: Far-right and far-left activists clashed Sunday, when the far-left were protesting Pope Benedict XVI's opposition to condoms, a police source in Paris, France said. A group of about 30 activists threw condoms on the ground outside Notre-Dame cathedral, when attendants of the Sunday mass left the cathedral. The police arrested three people after the incident. About 20 youths, some of whom were carrying signs reading "Leave my Pope alone" approached the protesters. One person was injured.
sentence2: Pope Benedict XVI lives at the Notre-Dame cathedral.