Iran says it will not give black boxes of the wrecked plane to the United States

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Video: this is how the Ukrainian plane crashed in Tehran 0:34

(CNN) - Iran says it will not deliver to the US authorities the black boxes of the Ukrainian Airlines Boeing 737 that crashed when it took off from Tehran.

Speaking to Iran's Meof semi-official news agency, the head of the Civil Aviation Authority of Iran, Ali Abedzadeh, said the black boxes would be analyzed in the country where the accident occurred, according to ICAO standards ( International Civil Aviation Organization). He also said that Ukrainian researchers would be part of the process.

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However, Abedzadeh ruled out to involve the United States at any stage of the investigation. "We will not give the black box to the manufacturer [Boeing] or the United States," he said.

Without speaking in detail about the accident, the head of the Civil Aviation Authority of Iran revealed that the pilot did not report any problems to air traffic control, but said it was still too early to say what caused the accident.

"The cause of the accident will not be discovered or announced until the black box is analyzed," he added.

MIRA: Video captures the moment when the Ukrainian plane crashes in Tehran, Iran

A Ukrainian plane crashed near Imam Khomeini Airport in Tehran early Wednesday (local time), according to the Iranian semi-official news agency ISNA. The Boeing 737 belonging to Ukrainian Airlines had 176 occupants and crew on board and crashed shortly after takeoff due to technical difficulties, says ISNA. Preliminary reports suggest that the plane was on its way to Kiev.

All passengers and crew members aboard the crashed Ukrainian flight died, according to Iran's press television, citing Ali Khashani, a senior public relations officer at Imam Khomeini International Airport.

LOOK: The 176 people die aboard the Boeing 737 plane that crashed near the Imam Khomeini airport in Tehran

Iranian state news agency IRNA reported that 167 passengers and nine crew members were on board the flight.

The plane caught fire after crashing.

plane crashUkraine