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ran unintentionally shot down the Ukrainian plane that crashed near Tehran this week, killing 176 people, the nation's state media reported, according to CNN.

The general staff of Iran's armed forces said the crash Wednesday was due to human error. Iran targeted the passenger plane unintentionally, Press TV said.

"A sad day. Preliminary conclusions of internal investigation by Armed Forces: Human error at time of crisis caused by US adventurism led to disaster," Iranian Foreign Minister Javad Zarif tweeted. "Our profound regrets, apologies and condolences to our people, to the families of all victims and to other affected nations."

All the people on board the Boeing 737-800 were killed when the Kiev-bound plane crashed shortly after takeoff from Imam Khomeini Airport. The victims include 82 Iranians, 63 Canadians, 11 Ukrainians, 10 Swedes, four Afghans, three Germans and three British nationals.

Fragments of the plane had been taken to a hangar off-site to "reconstruct" it for the investigation, said Ali Abedzadeh, the head of Iran's Civil Aviation Authority. The victims' remains have been sent to a forensic lab for DNA testing.