Live updates: US-Iran tensions after Qassem Soleimani's killing

The US Federal Aviation Administration has said it would ban American airline carriers from operating in the airspace over Iraq, Iran, the Gulf of Oman and the waters between Iran and Saudi Arabia.

The announcement comes after Iran fired more than a dozen ballistic missiles targeting at least two military bases hosting US-led coalition personnel in Iraq.

The burial ceremony of Iran's slain general Qassem Soleimani, one of the country's most powerful figures, has begun in the general's hometown in Kerman.

Earlier on Tuesday, a stampede at the Soleimani's funeral procession killed at least 56 people and injured more than 200, causing a delay in the burial.

The general's remains arrived in Kerman for burial early on Tuesday, a day after millions of mourners gathered in the capital Tehran and the city of Qom in an emotionally charged funeral procession.

The remains of Soleimani were initially expected to be buried at the martyrs' cemetery between 2pm and 4pm (10.30 GMT to 12.30 GMT).

Iran used Fateh-313 surface-to-suface missiles to hit Ain al-Asad airbase, Iran's semi-official Fars news agency reported. 

US President Donald Trump will not deliver an address following the missile attacks on two Iraqi bases that house US troops, a White House official said.

Iran has started its "second round" of attacks against bases holding US troops in Iraq, the Tehran-based Tasnim news agency reported.

The second round of attacks started an hour after the first phase took place, the agency said.

Iraq's Popular Mobilisation Units (PMU), an umbrella grouping of militia groups, say they have started their own response against US forces without elaborating.

Lebanon's Hezbollah has said it will strike Israel if the US were to retaliate against rockets fired from Iran at US forces in Iraq, Iran's Tasnim news agency reported.

The Iran-backed Hezbollah has fought several wars with Israel, including a 33-day war in 2006, which killed 1,200 people in Lebanon, mostly civilians, and 160 Israelis, mostly soldiers.

US House Speaker Nancy Pelosi tweeted she was following the events in Iraq. 

"Closely monitoring the situation following bombings targeting U.S. troops in Iraq," Pelosi said. "We must ensure the safety of our service members, including ending needless provocations from the Administration and demanding that Iran cease its violence. America & world cannot afford war." 

White House Press Secretary Stephanie Grisham said US President Donald Trump has been briefed and is monitoring the situation in Iraq. 

"We are aware of the reports of attacks on US facilities in Iraq," Grisham tweeted. "The President has been briefed and is monitoring the situation closely and consulting with his national security team."

In a clear dig at Trump, Saeed Jalili, one of the closest Iranian officials to Iran's Supreme Leader Ali Khamenei, posted a photo of an Iranian flag on Twitter after the rocket attack. Trump had tweeted an American flag after the assassination of Soleimani.

Tehran has threatened "more crushing responses" if the US retaliates for Wednesday's rocket attack, Iranian state TV said.

"We warn the Great Satan, the vicious and arrogant American regime, that any further malice or other mobility and aggression will face more painful and cruel responses," the IRGC said in a statement, referring to President Donald Trump, conveyed by Iran's Tasnim news agency.

Tehran fired more than a dozen ballistic missiles from Iranian territory against at least two Iraqi military bases hosting US-led coalition personnel, the Pentagon confirmed.

"We are working on initial battle damage assessments," Pentagon spokesman Jonathan Hoffman said in statement, adding that the bases targeted were the Ain al-Assad air base and another in Erbil, Iraq.

Several rockets have hit an airbase in Iraq that houses US troops, days after Iran's Supreme Leader Ali Khamenei vowed "severe revenge" for top general Qassem Soleimani's death.

Iran's Fars News Agency posted a video on Twitter late on Tuesday depicting what it said were Iranian missiles being fired at Ain al-Assad military base in Iraq. 

A US official confirmed to Reuters that rockets have been fired at the base.

CNN said 10 rockets targeted the air base.

Iran's Revolutionary Guard Corps, whose Quds Force was led by the slain Soleimani, claimed responsibility for the attack, saying that it was in response to the United States' "criminal and terrorist operation", referring to the assassination.

"We are aware of the reports of attacks on US facilities in Iraq," White House spokeswoman Stephanie Grisham said in a statement.

"The President has been briefed and is monitoring the situation closely and consulting with his national security team."

For more on this breaking news coverage, check out our story here.

Canada has announced it will pause its military operations in Iraq, stressing that necessary measures to protect forces have been taken in the fallout of the killing of Qassem Soleimani.

The country's defence chief Gen. Jonathan Vance made the announcement, in a letter that was tweeted by the Canadian military.

"The situation in Iraq is complex and it is best to pause our work there in order to fully concentrate our attention and efforts towards the safety and security of our personnel while the situation develops," Vance wrote. "Simply put, we're doing this to ensure their safety and security."

Vance said that Canadian operations in both the NATO training mission and the US-led coalition against the Islamic State (IS) group have both been suspended. 

Canada currently has 500 troops deployed in Iraq, and they will be moved to neighbouring Kuwait, according to the general.

As confusion over whether US troops are withdrawing from Iraq builds, as does tensions between Washington and Tehran, Middle East Eye has taken a look at where American troops are currently deployed across the region.

On Monday, the US military mistakenly sent a letter to the Iraqi government informing Baghdad that its soldiers had started withdrawing from the country. 

The Pentagon later clarified the letter was merely a draft that should not have been released, and it has no plans to immediately leave Iraq.

As it stands, Washington has 5,000 troops deployed in Iraq.

While Donald Trump said he would withdraw US troops from Syria last year, there still remain about 500-1000 troops. In Afghanistan, another place Trump said he'd get US troops out of, 12,000 American troops remain.

Washington also has a sizeable number of troops in Qatar, 10,000, Bahrain, 7,000, the United Arab Emirates, 5,000 and Saudi Arabia, 3,000.