Supporters of an influential Iraqi Shiite cleric fired rocket-propelled grenades and machine guns into Iraq’s Green Zone and security forces returned fire Tuesday, a serious escalation of a monthslong political crisis gripping the nation.

The death toll rose to at least 30 people after two days of unrest, officials said.

After cleric Muqtada al-Sadr announced Monday he would resign from politics, his supporters stormed the Green Zone, once the stronghold of the U.S. military that’s now home to Iraqi government offices and foreign embassies. At least one country evacuated its embassy amid the chaos.

Iraq’s government has been deadlocked since al-Sadr’s party won the largest share of seats in October parliamentary elections but not enough to secure a majority government — unleashing months of infighting between different Shiite factions. Al-Sadr refused to negotiate with his Iran-backed Shiite rivals, and his withdrawal Monday catapulted Iraq into political uncertainty and volatility with no clear path out.

Iran closed its borders to Iraq on Tuesday — a sign of Tehran’s concern that the chaos could spread, though streets beyond the capital’s government quarter largely remained calm. The country’s vital oil continued to flow, with global benchmark Brent crude trading slightly down.

A day after they stormed the Green Zone, supporters of al-Sadr could be seen on live television firing both machine guns and rocket-propelled grenades into the heavily-fortified area through a section of pulled-down concrete walls. Security forces armed with machine guns inside the zone sporadically returned fire.

Some bystanders filmed the gunfight with their mobile phones, though most hid behind still-standing segments of wall, wincing when rounds cracked nearby. As al-Sadr’s forces fired, a line of armored tanks stood on the other side of the barriers that surround the Green Zone, though they did not use their heavy guns.

At least one wounded man from al-Sadr’s forces was taken away in a three-wheel rickshaw, the Iraqi Foreign Ministry visible in the background. Heavy black smoke at one point rose over the area, visible from kilometers (miles) away.

At least 30 people have been killed and over 400 wounded, two Iraqi medical officials said. The toll included both al-Sadr loyalists killed in protests the day before and clashes overnight. Those figures are expected to rise, said the officials, who spoke on condition of anonymity because they weren’t authorized to release the information to journalists.

Members of Iraq’s majority Shiite Muslim population were oppressed when Saddam Hussein ruled the country for decades. The 2003 U.S.-led invasion that toppled Saddam, a Sunni, reversed the political order. Just under two-thirds of Iraq is Shiite, with a third Sunni.

Now, the Shiites are fighting among themselves after the Americans largely withdrew from the nation, with Iranian-backed Shiites and Iraqi-nationalist Shiites jockeying for power, influence and state resources.

It’s an explosive rivalry in a country where many remain way of the Iranian government’s influence even though trade and ties remain strong between its peoples. Iraq and Iran fought a bloody war in the 1980s that saw a million people killed.

Al-Sadr’s nationalist rhetoric and reform agenda resonates powerfully with his supporters, who largely hail from Iraq’s poorest sectors of society and were historically shut out of the political system under Saddam.

Al-Sadr’s announcement that he is leaving politics has implicitly given his supporters the freedom to act as they see fit.

Iranian state television cited unrest and a military-imposed curfew in Iraqi cities for the reason for the border closures. It urged Iranians avoid any travel to the neighboring country. The decision came as millions were preparing to visit Iraq for an annual pilgrimage to Shiite sites, and Tehran encouraged any Iranian pilgrims already in Iraq to avoid further travel between cities.

Kuwait, meanwhile, called on its citizens to leave Iraq. The state-run KUNA news agency also encouraged those hoping to travel to Iraq to delay their plans.

The tiny Gulf Arab sheikhdom of Kuwait shares a 254-kilometer- (158-mile-) long border with Iraq.

The Netherlands evacuated its embassy in the Green Zone, Foreign Affairs Minister Wopke Hoekstra tweeted early Tuesday.

“There are firefights around the embassy in Baghdad. Our staff are now working at the German embassy elsewhere in the city,” Hoekstra wrote.

Dubai’s long-haul carrier Emirates stopped flights to Baghdad on Tuesday over the ongoing unrest. The carrier said that it was “monitoring the situation closely.” It did not say when flights would resume.

On Monday, protesters loyal to al-Sadr pulled down the cement barriers outside the government palace with ropes and breached the palace gates. Many rushed into the lavish salons and marbled halls of the palace, a key meeting place for Iraqi heads of state and foreign dignitaries.

Iraq’s military announced a nationwide curfew, and the caretaker premier suspended Cabinet sessions in response to the violence.

AP