Hamas security forces arrested a Salafist leader last month, alleging that he was a supporter of ISIS, which holds vast swathes of territory in Syria and Iraq.
Gazan jihadis have pledged allegiance to ISIS in the past, but there has been no confirmation from the group itself that it has a presence in the coastal enclave.
via Jihadi group claims mortar attack on Hamas in Gaza | News , Middle East | THE DAILY STAR.