A Reform synagogue in Raleigh, North Carolina says several members have received threatening letters.

Temple Beth Or Executive Director Robert Gleiberman tells The News & Observer that nine board members and one member of the clergy received copies of the same letter containing “threatening language” at their homes Saturday.

Gleiberman says the letters had no return address and were sent through the U.S. Postal Service.

Religious school was canceled the next day in response, but Gleiberman says “right now we’re just moving on.”

Raleigh police spokeswoman Laura Hourigan says the FBI is assisting with the investigation.

(AP)