Catholic churches in southern New Jersey are taking extra precautions since the Diocese of Camden received a letter saying biological agents would be placed in holy-water fonts and ventilation systems, a diocesan spokesman said Tuesday. The diocese received an anonymous letter last week threatening to put biological contaminants in Catholic churches in New Jersey, said Andrew Walton, a spokesman for the diocese. The letter, which was mailed May 1 and has a Bellmawr postmark, was received in the Camden office May 4 and opened May 5. The letter has been turned over to the Camden County Prosecutor's Office, which is...