Iraqi Catholics have canceled the traditional Midnight Christmas Mass in Iraq due to “great fear” of terrorism, and individual Christians have been warned not to celebrate Christmas openly in order to diminish the risk of attack.

“Midnight Christmas Mass has been canceled in Baghdad, Mosul and Kirkuk as a consequence of the never-ending assassinations of Christians and the attack against Our Lady of Perpetual Help Cathedral on 31st October, which killed 57 people,” said Chaldean Catholic Archbishop Louis Sako of Kirkuk, according an Aid to the Church in Need Agency announcement. Christmas services will be held only during daylight hours.