Regulators urged airlines to avoid all Iranian airspace after Tehran admitted one of its missiles downed flight PS752 in a "disastrous mistake."
European foreign ministers met to discuss the Iran crisis and the 2015 nuclear deal at an emergency meeting in Brussels on Friday.
Iranian cabinet spokesman Ali Rabiei said that such allegations “rub salt on a painful wound” for the families of the victims.
Trump said there were no American casualties in the Iranian missile strike and "only minimal damage was sustained."
US Secretary of State Mike #Pompeo has been defending Trump's decision to kill Qassem Soleimani but refused to present evidence explaining why the Iranian military general was an "imminent threat".
A US airstrike on Iranian military leader Qassim Soleimani has brought the Middle East closer to conflict, as Iran narrows the scope of its possible responses to the assassination of a national hero.
"My message is simple and clear: stop escalation. Exercise maximum restraint. Restart dialogue," UN Secretary-General António Guterres said.
NATO Secretary General Jens Stoltenberg has called a meeting in Brussels to discuss the crisis.
The stampede erupted at a funeral procession for the top Iranian general killed in a US airstrike last week, Iranian state tv reported.
The U.S. has made no decision about withdrawing troops from Iraq, Defense Secretary Mark Esper said on Monday in response to a letter from a senior military officer that appeared to suggest a withdrawal was underway. The wording was an "honest mistake," he said.
The Pentagon said it will "follow the laws of armed conflict" and distanced itself from Trump's threat to target Iran's cultural sites.
Iran will no longer abide by any of the limits of its 2015 nuclear deal, the country's state television reported on Sunday.
Soleimani's death will also prove to be more significant than that of Osama Bin Laden or Abu Bakr al-Baghdadi, according to one of Italy's ex-foreign ministers.
"The Brits, the French, the Germans all need to understand that what we did ... saved lives in Europe," said Pompeo about the killing of Qassem Soleimani.
Iran has vowed retaliation for the assassination of Qassem Soleimani, but President Donald Trump says he ordered the strike to prevent a conflict.
The killing of Iranian General Qassem Soleimani has ignited fears the conflict between Iran and the US could spread through the whole region.
Reaction to the killing of Iran military chief Qassem Soleimani has been flooding in. Here's a chronological recap.