The North Sinai health directorate announced on Wednesday the death of a man injured in Friday's North Sinai terrorist attack, raising the number of those killed to 311, Al-Ahram Arabic website reported.
Abdel-Rahman Moussa, who was one of the 128 injured in the attack, died on Wednesday at El-Arish General Hospital of injuries he sustained in the attack, the health directorate said.
Most of the injured are still undergoing treatment at several hospitals, mainly in Ismailia and Cairo.
On Friday, 25 to 30 gunmen who were reportedly carrying flags of the Daesh terrorist group gunned down hundreds of worshippers during Friday prayers at the Al-Rawda Mosque, making it the deadliest terrorist attack in Egypt's recent history.
The gunmen rode up to the mosque in five SUVs and opened fire just as the imam began the Friday sermon, Egypt's Prosecutor-General Nabil Sadek said, citing eyewitnesses.
No group has claimed the responsibility of the attack.
Most of the terrorist attacks to take place in North Sinai in the last four years, which have mainly targeted security forces, have been claimed by the Daesh-affiliated North Sinai-based group Ansar Beit Al-Maqdis.