At least 235 people were killed when gunmen opened fire and bombed a mosque in Egypt’s volatile Sinai Peninsula on Friday. Government officials said 109 more had been injured in the attack — among the deadliest in Egypt’s history.   Police sources told the Associated Press that men in four off-road vehicles opened fire on worshippers in the al-Rawdah mosque in the town of Al Rawdah. NBC News could not immediately independently verify that account.

Two eyewitnesses and a security source told Reuters that the suspected militants targeted supporters of the security forces attending prayers. Citing official sources, the state-run MENA news agency reported that the mosque is largely attended by Sufi Muslims — a form of Islam considered heretical by some conservatives and extremists like the Islamic State group.  READ MORE