The Palestinian group says it is mourning Iran’s Supreme Leader Ayatollah Ali Khamenei after his killing in what it described as a “heinous” US-Israeli attack.

“He provided all forms of political, diplomatic and military support to our people, our cause, and our resistance,” Hamas said in a statement.

The US administration and Israel “bear full responsibility for this blatant aggression and heinous crime against the sovereignty of the Islamic Republic of Iran, and for its grave repercussions on the security and stability of the region,” it said.

Hamas also said the Arab and Muslim countries bear a “political, legal, and historical responsibility to take immediate and decisive action”.