BAGHDAD (AP) – Iraq’s Prime Minister Mustafa al-Kadhimi survived an assassination attempt with armed drones that targeted his residence early Sunday and officials said he was unharmed. The attack was a major escalation amid tensions sparked by the refusal of Iran-backed militias to accept last month’s parliamentary election results.

Two Iraqi officials told The Associated Press that seven of Mr. al-Kadhimi’s security guards were injured in the attack with two armed drones which occurred in Baghdad’s heavily fortified Green Zone area.

“I am fine and among my people. Thank God,” the prime minister tweeted shortly after the attack. He called for calm and restraint, “for the sake of Iraq.”

He later appeared on Iraqi television, seated behind a desk in a white shirt, looking calm and composed. “Cowardly rocket and drone attacks don’t build homelands and don’t build a future,” he said.

In a statement, the government said an explosives-laden drone tried to hit Mr. al-Kadhimi’s home. Residents of Baghdad heard the sound of an explosion followed by heavy gunfire from the direction of the Green Zone, which houses foreign embassies and government offices.

The statement released by state-run media said security forces were “taking the necessary measures in connection with this failed attempt.”

There was no immediate claim for the attack. It comes amid a stand-off between security forces and pro-Iran Shiite militias whose supporters have been camped outside the Green Zone for nearly a month after they rejected the results of Iraq’s parliamentary elections in which they lost around two-thirds of their seats.

“The assassination attempt is a dramatic escalation, crossing a line in unprecedented fashion that may have violent reverberations,” wrote Ranj Alaaldin, a nonresident fellow at the Brookings Institution, in a post on Twitter.

Protests turned deadly Friday when the demonstrators tried to enter the Green Zone. Security forces used tear gas and live ammunition. There was an exchange of fire in which one protester affiliated with the militias was killed. Dozens of security forces were injured. Mr. al-Khadimi ordered an investigation to determine what sparked the clashes and who violated orders not to open fire.

Some of the leaders of the most powerful militia factions loyal to Iran openly blamed al-Kadhimi for Friday’s clashes and the protester’s death.

“The blood of martyrs is to hold you accountable,” said Qais al-Khazali, leader of the Asaib Ahl al-Haq militia, addressing Mr. al-Kadhimi at a funeral held for the protester Saturday. “The protesters only had one demand against fraud in elections. Responding like this [with live fire] means you are the first responsible for this fraud.”

The funeral was attended by leaders of the mostly Shiite Iran-backed factions who together are known as the Popular Mobilization Forces, or Hashd al-Shaabi in Arabic.

Abu Alaa al-Walae, commander of Kataib Sayyid al-Shuhada, in a tweet apparently addressed to Mr. al-Kadhimi that did not name him told him to forget about another term.

Mr. al-Kadhimi, 54, was Iraq’s former intelligence chief before becoming prime minister in May last year. He is considered by the militias to be close to the U.S., and has tried to balance between Iraq’s alliances with both the U.S. and Iran. Prior to the elections, he hosted several rounds of talks between regional foes Iran and Saudi Arabia in Baghdad in a bid to ease regional tensions.