A Salafist group affiliated with the Islamic State of Iraq and Syria (ISIS) fired a mortar at Hamas headquarters in Gaza, The Jerusalem Post reported today. The mortar attack is the latest escalation between the two groups this week.

The group, which calls itself “Supporters of Islamic State of Iraq and Syria in Jerusalem,” said in an online statement that the rockets it fired were aimed at a base occupied by Hamas’s armed wing, Izzadin Kassam

The attack comes amid mounting tensions between Hamas and Islamic State supporters in the Gaza Strip. Hamas arrested dozens of Salafi-jihadists who are affiliated with Islamic State, sources in the Gaza Strip said on Thursday. They said the arrests came following a series of bombings, which were reportedly carried out by the Salafi-jihadists in recent weeks.

Earlier this week, Hamas demolished a mosque frequented by Islamic State supporters in Deir el-Balah.

The Salafist group had threatened to attack Hamas if it did not release some 40 “Salafi Mujahideen,” who are being held in Hamas jails.

[Photo: wochit news / YouTube ]