The missile thesis was favored by several countries including Canada and the United States, it is confirmed by Tehran.
Iranian President Hassan Rouhani said on Saturday that his country "deeply" regrets having shot down a Ukrainian civilian plane, "he said.
On Wednesday, 176 people died in the Boeing 737-800 of Ukraine Airlines International.
"The internal investigation of the armed forces concluded that regrettably missiles launched in error caused the crash of the Ukrainian plane and the death of 176 innocent people", estimated Rouhani on Twitter, adding that "the investigations are continuing to identify and bring to justice "those responsible.
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