The death toll from the attack on the Al-Rawdah Mosque in Egypt’s Sinai Peninsula rose to over 300, the state prosecutor said Saturday.

The death toll includes at least 27 children. More than 100 people were also wounded in the Friday attack.

One witness, 38-year-old Ebid Salem Mansour, told the Associated Press, “The shooting was random and hysterical at the beginning and then became more deliberate. Whoever they weren’t sure was dead or still breathing was shot dead.”

“The worshippers were taken by surprise by these elements,” the prosecutor said in a statement, citing accounts from survivors.  “They numbered between 25 and 30, carrying the Daesh [IS or Islamic State] flag and took up positions in front of the mosque door and its 12 windows with automatic rifles.”

Their strategy also included setting multiple cars on fire outside the mosque to prevent people from escaping. The attackers also opened fire on ambulances as they tried to take away the wounded, CNN reports, citing witnesses.

No group has yet claimed responsibility for attack. But the Islamic State “is the main suspect as the mosque is associated with followers of the mystical Sufi branch of Sunni Islam whom it has branded heretics,” AFP reports.

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