ISIS has vowed to overthrow Hamas from the Gaza Strip in a chilling execution video.
The terror group accused the influential Palestinian organisation of not doing enough to stop Donald Trump from declaring Jerusalem is Israel's capital.
The US President's decision caused outrage in the Middle East with Hamas themselves calling it a 'declaration of war'.
However, a new ISIS propaganda video, that has appeared on monitoring agency SITE, urges followers to mount attacks on Hamas positions in Gaza.
The full 22-minute video shows a man, identified by International Business Times as Abu Kazem al-Maqdisi, urging followers to mount attacks on Hamas positions.