Egypt's Sisi vows forceful response after attack kills 235

On Friday, bombs were set off targeting the mosque.

The mosque was surrounded by dozens of gunmen who opened fire on worshippers who tried to escape.

The gunmen reportedly burnt vehicles parked in the area to block access to the mosque.

They also targeted ambulances which were attempting to save victims with gunfire. Hospitals were overwhelmed as at least 100 people were wounded.

"What is happening is an attempt to stop us from our efforts in the fight against terrorism," Sisi said.

"The armed forces and the police will avenge our martyrs and restore security and stability with the utmost force," he added.

The Egyptian army said fighter jets have bombed "terrorist spots" storing weapons and ammunition.

Three days of mourning have also been declared in Egypt.

Locals claim followers of Sufism regularly gathered and prayed at the mosque.

While the moderate Sufis have gained widespread acceptance across the world, some extremist groups such as ISIS consider them as heretics.

Last year, a local ISIS outfit threatened to kill Sufis who didn't "repent."

Meanwhile, the BBC has reported that militants have never before targeted worshippers inside a mosque in North Sinai.