The US has insisted it had “exquisite intelligence” before ordering the drone strike that killed Iranian military commander Qassem Soleimani in Baghdad.
American defence secretary Mark Esper told reporters General Soleimani was planning an attack within days, rather than weeks, and was a “legitimate target”.
Meanwhile, US president Donald Trump has backtracked on his threat to target 52 Iranian cultural sites in military attacks, saying he would obey international law.
Soleimani's burial was delayed by several hours after at least 56 people were killed and 213 others injured after a stampede broke out during the funeral procession in his hometown of Kerman.
Dominic Raab, the foreign secretary, flew to Brussels for emergency talks with the French and German foreign ministers about the situation in the Middle East and the escalating conflict in Libya.
The Agence France-Presse news agency is also reporting that a US air base has come under rocket bombardment, citing a security source.
The Pentagon has said it is aware of media reports of the bombing but made no comment.
At least six rockets have landed at Iraq's Ain Al-Asad airbase, which contains US forces, Reuters news agency has reported.
Washington Post journalist Dan Lamothe has said a US defence official confirmed that the airbase had been hit.
'Soleimani was a monster', says Trump
US president Donald Trump says he saved a lot of lives by ordering the killing of Qassem Soleimani, branding the Iranian general a "monster".
As he and his top advisers face mounting pressure to disclose more detail about the intelligence that led to the killing, Mr Trump said: "He's been called a monster, and he was a monster, and he's no longer a monster, he's dead."
He added: "We saved a lot of lives. They were planning something."
Donald Trump welcomed Greece's prime minster to the White House, saying the US was very proud of the "come back" the country is making.
From 2010 to 2018, Greece survived on bailout loans from its European partners and the International Monetary Fund.
It exited the rescue programme more than a year ago, but remains under strict supervision from lenders and has committed to achieving stringent budget targets for years to come.
Prime minister Kyriakos Mitsotakis said his country was "following a recipe" that has worked in the US, including lower taxes, and the Greek economy has reacted positively.
Mr Mitsotakis said he was looking for Mr Trump's support in calling on American companies to invest in Greece.
Merkel discusses Iran and Iraq with Trump during phone call
US president Donald Trump and German chancellor Angela Merkel discussed "the tense situation regarding Iran and Iraq," a German government spokesman has said.
"They also exchanged views on the current situation in Libya and the political efforts to resolve the conflict in that country," spokesman Steffen Seibert said in a statement, adding: "They agreed to remain in contact on this issue."
Some 200 Iranian-Americans were reportedly detained at the US-Canada border over the weekend.
Negah Hekmati and her family, who are American citizens of Iranian descent, were made to wait in a room for five hours when they arrived at the border on their way back to Seattle after a skiing trip.
This is despite several no-hassle trips between their home and Vancouver over the holidays.
Ms Hekmati said her five-year-old daughter, who was born in the US, suggested that they should all avoid speaking Persian while they were stopped and questioned.
Read this story by Clark Mindock, in New York, and diplomatic correspondent Negar Mortazavi:
'I don't want my kids to accept this': Iranian-Americans questioned at US border fear impacts of Trump's Middle East tactics
Donald Trump says he 'likes to obey the law' when asked if Iranian cultural sites would be targeted by the US
Here is our full round-up of the day.
Grief, anger and tragedy have engulfed Iran as the body of Qassem Soleimani, the Iranian general slain in an airstrike ordered by Donald Trump last week, was laid to rest in his hometown of Kerman, where a stampede during the procession killed dozens, write Borzou Daragahi and Andrew Buncombe.
At least 50 people were killed and 213 injured during the funeral march, delaying the ceremony, ISNA news agency said, quoting the province’s chief coroner.
Most of the dead and injured were elderly people who had been walking from the central Azadi Square towards Beheshti Street when they became trapped in the huge crowds, state media reported.
At least 50 killed in stampede at funeral for Soleimani in Iran, as parliament designates US forces ‘terrorists’
‘We say to our enemy: we will take revenge,’ says commander-in-chief of Iran’s Revolutionary GuardCroatia's defense ministry says the country's 14 troops in Iraq have been moved to Kuwait amid soaring tensions after a U.S. airstrike killed Iran's top commander in Baghdad last week.
The statement said any future steps would be made in consultation with Nato allies.
A growing number of European countries are shifting troops out of Iraq.
Germany says it has moved 35 soldiers serving in Iraq to neighboring Jordan and Kuwait. Slovakia says it has moved its seven service members from Iraq to an unspecified location.
Slovenia, however, says its six soldiers in Iraq are staying there. They are posted at the Erbil base in northern Iraq. The defense ministry says it is constantly monitoring the situation and will make further decisions based on future developments.
Donald Trump and his top advisers are facing mounting pressure to disclose more detail about the intelligence that led him to order the killing of top Iranian General Qassem Soleimani.
The US president said the move "saved a lot of lives" and that Soleimani was "planning something".
Meanwhile, defence secretary Mark Esper told reporters the military commander's threat against Americans was "days away", and secretary of state Mike Pompeo said he had been continuing efforts to build a network of activities "that were going to lead potentially to the death of many more Americans".
However senate minority leader Chuck Schumer and senator Bob Menendez, the top Democrat on the senate foreign relations committee, have called on the president to declassify the written notification he sent to congress after the fatal strike.
Fair point here from Fox News' Bret Baier:
Jeremy Corbyn has accused Boris Johnson of providing “cover” to Donald Trump over the killing of Iranian general Qassem Soleimani because of his dependence on a post-Brexit trade deal with the US president.
Mr Corbyn branded the drone strike on the leader of Iran’s feared Quds Force an “assassination” and told the House of Commons that it was widely regarded as illegal.
And he accused the prime minister of hiding away from scrutiny after Mr Johnson sent defence secretary Ben Wallace to answer MPs’ questions on the 3 January killing in Baghdad.
Read the full story from political editor Andrew Woodcock:
Read the full story from political editor Andrew Woodcock:
Donald Trump says he 'likes to obey the law' when asked if Iranian cultural sites would be targeted by the US
The first test of Britain's post-Brexit diplomatic capabilities kicked off in Brussels today as the Foreign Secretary met for emergency talks with his European counterparts to find a joint way forward on unfolding the Iran crisis, writes Europe correspondent Jon Stone.
Dominic Raab held meetings with the French and German foreign ministers, as well as the EU's top diplomat Josep Borrell, to work out the details of the united front on the issue the powers want to present.
The sensitive talks broke up as night fell on Brussels with little to show in public, though the Foreign Office described the meetings as "productive".
More on this:Dominic Raab flies to emergency Brussels talks on Iran crisis
Trump 'puts US on brink of war'
Democratic presidential candidate Joe Biden has said Donald Trump's escalation of tensions with Iran proves him to be "dangerously incompetent" and puts the US on the brink of war.
Speaking in New York, Mr Biden claimed the US president used a "haphazard" decision-making process to order the killing of Qassem Soleimani and has thus far failed to communicate his rationale to congress of US allies around the world.
Mr Biden said his Republican presidential rival instead offered "tweets, threats and tantrums" that prove he is "dangerously incompetent and incapable of world leadership."
Tory peer warns Johnson to stay out of US-Iran conflict
Former Conservative Party chairman Michael Ancram, who sits as the Marquess of Lothian in the Lords and is a member of parliament's intelligence and security committee, said: "What happened in Baghdad last week was ethically unacceptable.
"This was no strategic military act. This was a foolhardy act of policy which historical precedent teaches us can lead to dramatic and dangerously unpredictable consequences.
"It was wrong and we should be no part of it."
"It was wrong and we should be no part of it."
Inappropriate for US to hit cultural sites
US Senate majority leader Mitch McConnell has said it would not be appropriate for the US to strike Iranian cultural sites - a move threatened by president Donald Trump.
The Iranian vice president has said Donald Trump made a “serious mistake” by assassinating Qassem Soleimani.
Massoumeh Ebtekar told CNN: “The American president made a serious miscalculation, they made a serious mistake by assassinating, by taking this terrorist action, against Commander Soleimani, and I’m sure that they regret what they’ve done.”
US would only consider sanctions on Iraq if it is not treated with respect, president says
