Video appears to show missile striking Ukrainian plane

Tehran, Iran — American officials believe Iran mistakenly shot down Ukraine International Airlines Flight 752 after it took off Wednesday from Tehran’s airport, killing all 176 people on board.

Ukrainian officials said they are investigating several theories to explain the crash.

The plane, a Boeing 737-800, went down in the outskirts of Tehran just hours after Iran launched a barrage of missiles at U.S. forces.

Mobile users see video here.

Here are the latest updates:

Update 4:55 a.m. EST Jan. 10: Iranian officials denied allegations by at least two Western nations on Friday that a Ukrainian jetliner that crashed near Tehran earlier this week was brought down by an Iranian surface-to-air missile, The Associated Press reported.

Ali Abedzadeh, head of Iran’s national aviation department, said during a press conference, “What is obvious for us, and what we can say with certainty, is that no missile hit the plane.”

Abedzadeh then urged both U.S. and Canadian leaders to share any information they have on the crash to the contrary, the AP reported.

“If they are really sure, they should come and show their findings to the world,” he said.

Meanwhile, the head of Iran’s investigation team, Hassan Rezaeifar, said it could take more than one month to recover data from the plane’s black box flight recorder, the extraction of which might require assistance from international experts.

The entire investigation, Rezaeifar told the press conference, could last until 2021, the AP reported.