JERUSALEM >> Thousands of mourners converged around the flag-draped coffin of Hamas’ slain political chief, Ismail Haniyeh, in the emirate of Qatar on Friday as the fallout surged from his death in an alleged Israeli attack.

The funeral ceremony in Doha, Qatar’s capital, attended by members of Gaza’s Hamas and Islamic Jihad groups, as well as Qatari and Iranian officials, was subdued. But across the Muslim world — from Jordan and Morocco to Yemen and Somalia — angry crowds waving Palestinian flags rushed out of mosques after midday Friday prayers, chanting for revenge.

“Let Friday be a day of rage to denounce the assassination,” said Izzat al-Risheq, a senior Hamas official. Haniyeh had lived in Qatar, along with other senior members of Hamas’s political leadership.

Following the back-to-back assassinations of Haniyeh in Tehran early on Wednesday and top Hezbollah commander Fuad Shukr in Beirut the evening before, international diplomats have scrambled to head off a full-fledged regional war. Iran and its proxies vowed to retaliate. Major airlines canceled flights to Tel Aviv, Israel and Beirut, Lebanon.

Cyprus said Friday it was preparing for possible mass evacuations of foreign citizens via the island nation, in case of a wider war. France beefed up security for Jewish communities nationwide. Poland warned its citizens against traveling to the Mideast. Pakistan and Turkey lowered their flags to half-staff, prompting Israel to summon Turkey’s deputy ambassador for a “stern reprimand.”

Turkey’s foreign ministry spokesperson Oncu Keceli shot back that Israel “cannot achieve peace by killing the negotiators” — a reference to Haniyeh’s role in the cease-fire talks — while hundreds of Turks gathered at the historic Hagia Sophia to pay tribute to the slain Hamas leader as his funeral service got underway in Doha.

“We are sure that his blood will bring out victory, dignity and liberation,” senior Hamas official Khalil al-Hayya, seen as a possible successor to Haniyeh, said from the Doha mosque where Haniyeh’s coffin was displayed beside that of his bodyguard who was also killed in the attack in Tehran.

Israel has not confirmed or denied its role in the targeted killing of Haniyeh. On Thursday, Israel announced that it killed the shadowy leader of Hamas’ military wing, Mohammed Deif, in a July airstrike. Hamas had previously claimed Deif survived last month’s targeted airstrike in the besieged Gaza Strip, and has not commented on Israel’s more recent claim.

The deadly pattern of Israeli airstrikes and skirmishes has continued in Gaza, where Palestinian Civil Defense rescuers reported that a barrage of airstrikes Friday in southern Gaza City killed five Palestinians, including three children. The Israeli military said it had destroyed rocket launchers used by Hamas hours earlier.

There were no services held for Haniyeh in the enclave, where the extent of loss has become so overwhelming that Palestinians are forced to inter their dead family members hurriedly and without last rites.