BAGHDAD (AP) -- Thousands of mourners chanting "America is the Great Satan" marched in a funeral procession Saturday through Baghdad for Iran's top general and Iraqi militant leaders, who were killed in a U.S. airstrike.
Gen. Qassem Soleimani, the head of Iran's elite Quds force and mastermind of its regional security strategy, was killed in an airstrike early Friday near the Iraqi capital's international airport. The attack has caused regional tensions to soar.
Iran has vowed harsh retaliation, raising fears of an all-out war. U.S. President Donald Trump says he ordered the strike to prevent a conflict. His administration says Soleimani was plotting a series of attacks that endangered American troops and officials, without providing evidence.
An official with the U.S.-led coalition in Iraq said it has scaled back operations and boosted "security and defensive measures" at bases hosting coalition forces in the country. The official spoke on condition of anonymity according to regulations.
Washington has dispatched another 3,000 troops to neighboring Kuwait.
Soleimani was the architect of Iran's regional policy of mobilizing militias across Iraq, Syria and Lebanon, including in the war against the Islamic State group. He was also blamed for attacks on U.S. troops and American allies going back to the 2003 invasion of Iraq.
The mourners, mostly men in black military fatigues, carried Iraqi flags and the flags of Iran-backed militias that are fiercely loyal to Soleimani. They were also mourning Abu Mahdi al-Muhandis, a senior Iraqi militia commander who was killed in the same strike.
The mourners, many of them in tears, chanted: "No, No, America," and "Death to America, death to Israel." Mohammed Fadl, a mourner dressed in black, said the funeral is an expression of loyalty to the slain leaders. "It is a painful strike, but it will not shake us," he said.
Two helicopters hovered over the procession, which was attended by Prime Minister Adel Abdul-Mahdi and leaders of Iran-backed militias. The procession later made its way to the Shiite holy city of Karbala, in central Iraq.
The gates to Baghdad's Green Zone, which houses government offices and foreign embassies, including the U.S. Embassy, were closed.
Iraq, which is closely allied with both Washington and Tehran, condemned the airstrike that killed Soleimani and called it an attack on its national sovereignty. Parliament is to meet for an emergency session on Sunday, and the government has come under mounting pressure to expel the 5,200 American troops based in the country, who are there to help prevent a resurgence of the Islamic State group.
Hadi al-Amiri, who heads a large parliamentary bloc and is expected to replace al-Muhandis as deputy commander of the Popular Mobilization Forces, an umbrella group of mostly Iran-backed militias, was among those paying their final respects.
"Rest assured," he said before al-Muhandis' coffin in a video circulated on social media. "The price of your pure blood will be the exit of U.S. forces from Iraq forever."
The U.S. has ordered all citizens to leave Iraq and closed its embassy in Baghdad, where Iran-backed militiamen and their supporters staged two days of violent protests earlier this week in which they breached the compound.
Britain and France also warned their citizens to avoid or strictly limit travel in Iraq.
No one was hurt in the embassy protests, which came in response to U.S. airstrikes that killed 25 Iran-backed militiamen in Iraq and Syria. The U.S. said the strikes were in response to a rocket attack that killed a U.S. contractor in northern Iraq, which Washington blamed on the militias.
Tensions between the U.S. and Iran have steadily intensified since Trump's decision to withdraw from the 2015 nuclear deal and restore crippling sanctions.
The administration's "maximum pressure" campaign has led Iran to openly abandon commitments under the deal. The U.S. has also blamed Iran for a wave of increasingly provocative attacks in the region, including the sabotage of oil tankers in the Persian Gulf and an attack on Saudi Arabia's oil infrastructure in September that temporarily halved its production.
Iran denied involvement in those attacks, but admitted to shooting down a U.S. surveillance drone in June that it said had strayed into its airspace.
On Saturday, billboards appeared on major streets in Iran showing Soleimani and carrying the warning from Supreme Leader Ayatollah Ali Khamenei that "harsh revenge" awaits the US.
Iranian President Hassan Rouhani visited Soleimani's home in Tehran to express his condolences.
"The Americans did not realize what a great mistake they made," Rouhani said. "They will see the effects of this criminal act, not only today but for years to come."
On the streets of Tehran, many said they mourned Soleimani and some demanded revenge.
"I don't think there will be a war, but we must get his revenge," said Hojjat Sanieefar. America "can't hit and run anymore," he added.
Another man, who only identified himself as Amir, was worried.
"If there is a war, I am 100% sure it will not be to our betterment. The situation will certainly get worse," he said.
Global powers had warned Friday that the killing of Soleimani could spark a dangerous new escalation, with many calling for restraint.
Iran's state TV reported that Qatar's foreign minister, Sheikh Mohammed bin Abdulrahman Al Thani, made an unplanned trip to Iran where he met with his counterpart, Foreign Minister Mohammad Javad Zarif. The Qatari diplomat was also set to meet with Rouhani.
Qatar hosts American forces at the Al-Udeid Air Base and shares a massive offshore oil and gas field with Tehran. It has often served as a regional mediator.
Adel al-Jubeir, the Saudi minister of state for foreign affairs, took to Twitter to reiterate the kingdom's call for "self-restraint" to avoid "unbearable consequences."
Another Saudi official confirmed to The Associated Press that the U.S. did not give a heads-up to Saudi Arabia or its other Gulf allies before carrying out the strike that killed Soleimani. The official was not authorized to discuss security matters and so spoke on condition of anonymity.
Italy's Foreign Minister meanwhile condemned the strike that killed Soleimani, in a rare criticism of the U.S. strike from a Western ally.
In a Facebook post, Luigi Di Maio said the use of violence threatens to bring "destabilization and devastating humanitarian and migratory effects."