Reuters: Islamic State sympathizers in the Gaza Strip are making their presence felt on social media, but the enclave’s Hamas rulers said on Thursday the group has no real foothold in the Palestinian territory.

Statements signed “Supporters of the Islamic State” have appeared recently on Twitter and several websites, accusing the Islamist group Hamas of arresting dozens of jihadists and threatening attacks in Gaza unless they are released.

Hamas said it had detained what it described as “lawbreakers” after an explosion earlier this month near a Hamas security headquarters and another blast outside the headquarters of the United Nations Relief and Works Agency.