Influential Iraqi cleric Moqtada al-Sadr called on his supporters to withdraw Tuesday from the Green Zone, where they have traded heavy fire with security forces in a serious escalation of a monthslong political crisis gripping the nation.

In a televised speech, Sadr gave his supporters an hour to leave. The unrest broke out Monday, when Sadr announced he would resign from politics and his supporters stormed the Green Zone, once the stronghold of the US military that’s now home to Iraqi government offices and foreign embassies. At least 30 people have been killed, officials said.

Iraq’s government has been deadlocked since 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. 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 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 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 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 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.

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.

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.

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.

On Monday, protesters loyal to 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.Hi