The jetliner crash killed 176 people, including at least 63 Canadians.
The information is based on US intelligence, said CBS anchor Major Garrett, which sources say "picked up signals of radar being turned on. US satellites also detected, we are told, two missile launches which happened shortly before the plane exploded."
Newsweek reported that the jetliner, a Boeing 737–800 en route from Tehran Imam Khomeini International Airport to Kyiv's Boryspil International Airport, is believed to have been struck by a Russian-built Tor-M1 surface-to-air missile system, known to NATO as Gauntlet.
The Newsweek story was based on information provided by a Pentagon official, a senior U.S. intelligence official and an Iraqi intelligence official. Both the Pentagon and U.S. intelligence officials believed the shootdown was accidental, according to Newsweek.
The Pentagon did not have any information about the issue when asked by Task & Purpose soon after the Newsweek story broke.
President Donald Trump said during a speech at the White House on Thursday that the crash could have been caused by "a mistake on the other side."
"It's a tragic thing. But somebody could've made a mistake on the other side. … not our system," Trump said. "It has nothing to do with us. Some people say it's mechanical. I personally don't think that's even a question."
"I have a feeling that something very terrible happened," he added.
The Wall Street Journal reported that a U.S. official familiar with the matter said Wednesday that data transmitted via satellite indicated everything was normal on the jetliner until the sudden loss of data and the fatal dive. That data suggest to some U.S. air-safety officials that there may have been some sort of hostile act, said the person, who also cautioned that it was too early to draw conclusions.
However, The Wall Street Journal also reported that Iranian officials, quoted by the state news agency, said the plane had suffered a technical fault, that it had started to turn back in the direction of Tehran airport and was already on fire before it hit the ground. They said the jet had reached 8,000 feet before disappearing from radar Wednesday.
"Since the Ukrainian pilot was trying to return to the airport, a rocket, missile strike or the country's defense system is out of question," said Hassan Rezaifar, head of Iran's Civil Aviation Organization commission for accidents investigation, quoted by Iran's state news agency, according to The Wall Street Journal. "No missile part was found in the crash scene."
Jeff Schogol contributed reporting.
This is a breaking news story. It will be updated.