 FBI warns of threat to synagogues. A tweet from the office said, the FBI has received credible information of a broad threat to synagogues in New Jersey. We ask that the time that you take all security precautions to protect your community and facility. We will share more information as soon as we can. Stay alert in case of emergency, call police. According to reports, the alert was posted after officials discovered an online threat directed broadly at synagogues in New Jersey. A law enforcement official said, the posting did not target any specific synagogue by name, the official said.