Police sources told the Associated Press that men in four off-road vehicles opened fire on worshippers inside the mosque during a sermon. …

wo eyewitnesses and a security source told Reuters that the suspected militants targeted supporters of the security forces attending prayers. Citing official sources, state-run MENA 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.

There have been a wave of attacks on the country’s Coptic Christian minority, but strikes on mosques are rare and have shocked many throughout Egypt. …

While Egypt’s security forces have been battling an Islamist militants in northern Sinai for years, violence picked up after the 2013 ouster of President Mohammed Morsi. A new group called Ansar al-Islam claimed responsibility for a bloody October attack on Egyptian police. https://www.nbcnews.com/news/world/egypt-mosque-attack-leaves-dozens-dead-wounded-n823746