KYIV, Ukraine - Iranian and Ukrainian officials have begun investigating the crash of a Ukrainian airliner near Tehran, Iran's aviation authority said on Friday, amid mounting claims that the jet was shot down.

All 176 people on board the Ukrainian International Airlines Boeing 737 airliner died when it crashed in a field shortly after takeoff on Wednesday morning.

Most of the victims were Iranian and Canadian citizens. Canadian Prime Minister Justin Trudeau has said that evidence suggests the airliner was downed by an Iranian surface-to-air missile.

Iran's top aviation official said an investigation would determine what caused the crash, but that he was certain a missile was not the cause.

"We can state it with certainty that no missile has hit this aeroplane," Ali Abedzadeh said at a news conference in Tehran, according to Iran's Press TV.

"The plane was flying for over 1 1/2 minutes while it was on fire, and the crash site shows the pilot had decided to return (to the airport)," he said.

Ukrainian President Volodymyr Zelenskiy has remained cautious, saying the missile scenario has not been ruled out.

"We call on all our international partners, especially the U.S., Canada and Britain, to present any evidence pertaining to the catastrophe," Zelenskiy said in a statement.

Iran maintains that the plane went down due to a technical problem. Ukrainian state media initially reported that the most likely cause was an engine fire.

Investigators are concentrating on the damaged black box flight recorders recovered from the crash site.

Abedzadeh said Iran will try to download the data but, if unsuccessful, will turn to other countries for help.

Iranian government spokesman Ali Rabiei said representatives from U.S. aerospace giant Boeing are also welcome to participate in the probe.

The incident occurred hours after Iran fired missiles at bases housing U.S. troops in neighboring Iraq in retaliation for the killing of a top Iranian general in a U.S. airstrike.

Ukrainian investigators have been considering several possible scenarios, including that the plane could have been hit by a Russian-made Tor missile.

Some of those investigators were involved in determining that an anti-aircraft missile shot down Malaysia Airlines Flight MH17 over eastern Ukraine in 2014.

The European Commission refused to speculate about a possible cause of Wednesday's crash, saying it would await the findings of the official investigation.

A spokesman for the EU executive called for an "independent and credible" civil aviation investigation.

While the commission remained tight-lipped, several EU foreign ministers pointed the finger at Iran on their way into EU top diplomat crisis talks in Brussels.

"It is indeed very likely that the plane has been shot down by Iranian missiles," Dutch Foreign Minister Stef Blok said.

"It's clear that it was an accident" but "176 lives have been wantonly destroyed," Luxembourg's top diplomat Jean Asselborn said.

Trudeau on Thursday cited "intelligence from multiple sources" suggesting that the plane was shot down. "This may well have been unintentional," he said.

British Prime Minister Boris Johnson echoed Trudeau, saying in a statement that "a body of information" pointed to an Iranian surface-to-air missile hitting the plane, perhaps in error.

French Foreign Minister Jean-Yves Le Drian called for the "fullest transparency" on the circumstances of the disaster, amid reports that the plane's engines could have been produced at least partially in France.

"If we are asked, we could provide our expertise," he told RTL radio. "For the moment, we have not been asked."

Sweden's top diplomat said that 17 people with ties to Sweden, including seven people with Swedish citizenship and 10 others with residency in the Scandinavian country, were killed in Wednesday's plane crash.

"They were all someone's child, classmate, friend or colleague. My thoughts are with the families," Swedish Foreign Minister Ann Linde said.

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