In a video published through social media accounts on Tuesday, ISIS threatened to wipe out Hamas for only laxly practicing Sharia (Islamic law) in the Palestinian territory of Gaza, Reuters has reported.
The video was issued as a challenge to Hamas, which rules the Gaza Strip and is known for its crackdowns on different militant groups in the Palestinian territory.
"We will uproot the state of the Jews [Israel] and you and Fatah, and all of the secularists are nothing and you will be over-run by our creeping multitudes," a masked ISIS member said in the message which addressed Hamas as “tyrants.”
"The rule of Sharia [Islamic law] will be implemented in Gaza, in spite of you. We swear that what is happening in the Levant today, and in particular the Yarmouk camp, will happen in Gaza," he said, referring to ISIS advances in Syria, including a district of Damascus inhabited by Palestinian refugees.
Capturing a considerable amount of territory in Iraq and Syria, ISIS has also been behind attacks in Egypt, Libya, Tunisia and Yemen.
Despite being referred as a terrorist group by the US, European Union and Israel, Hamas defines itself as a national movement that not only defends Palestinian territory against Israeli occupation but also fights against radical groups inside the Gaza Strip.
However, Hamas' struggle against ISIS-linked groups has not won it sympathy abroad.
Israel's intelligence minister, Israel Katz, accused Hamas on Tuesday of supporting ISIS affiliates in the Egyptian Sinai - an accusation which Hamas rejected.
"There is cooperation between them in the realm of weapons smuggling and terrorist attacks. The Egyptians know this, and the Saudis," Katz told a Tel Aviv conference organised by the Israel Defense journal.
"At the same time, within Gaza, ISIS has been flouting Hamas. But they have common cause against the Jews, in Israel or abroad," he added.