CAIRO, Nov. 25 (Xinhua) -- Attackers of the mosque in Egypt's North Sinai province were carrying Islamic State (IS) flag, official MENA news agency reported on Saturday.
"Some 25-30 militants have gunned down the worshippers during the Friday prayer," said a statement of Egyptian General Prosecutor.
It added the death toll had risen to 305 people including 27 children, with 128 others wounded.
The case would be tackled as "a top emergency case of state security," it said.
The attack took place after the mosque's preacher started his speech, when the terrorists set fire to the windows and doors of the mosque, besieging the worshippers inside, the statement said.
Later, some masked men, carrying black flags reading "There is no God but Allah and Mohammed is his prophet," broke into the mosque with automatic weapons.
The attackers were riding five jeeps and they set seven cars of the worshippers ablaze before fleeing.
An explosive device went off on Friday outside a mosque near the Arish city in North Sinai, before militants opened fire at the prayers.
No group has declared responsibility for the attack yet.
