• The crash killed all 167 passengers and nine crew members on Ukraine International Airlines Flight 752.
  • The plane was a Boeing 737-800, not the Max model that was grounded almost a year ago after two crashes.
  • The cause of the crash was not immediately known.

A Kyiv-bound Ukraine International Airlines Boeing 737 plane crashed minutes after takeoff from Tehran on Wednesday, killing all 176 people on board.

The Boeing 737-800, which was carrying 167 passengers and nine crew members, was an older model of the Boeing 737 Max that has been grounded worldwide since mid-March after two fatal crashes.

Flight 752 crashed shortly after 6 a.m. local time, minutes into the flight. Press photos showed emergency workers combing through a wide field of wreckage outside Tehran.

GP: Iran Boeing 737 plane crash All passengers, crew members killed in Iran plane crash
Search and rescue works are conducted at site after a Boeing 737 plane belonging to a Ukrainian airline crashed near Imam Khomeini Airport in Iran just after takeoff with 180 passengers on board in Tehran, Iran on January 08, 2020. Fatemeh Bahrami | Anadolu Agency | Getty Images

The cause of the crash, which came hours after Iran launched retaliatory missile strikes on U.S. positions in Iraq for the killing of Gen. Qasem Soleimani, was not immediately known. Such determinations take months, but Iran’s Fars news agency reported that the jet crashed due to technical problems, without providing more detail.

Ukraine International Airlines said that the aircraft had been carrying citizens of Canada, Iran, Sweden and Ukraine. It has suspended flights to Tehran indefinitely. Ukraine’s foreign minister separately said there were four passengers from Afghanistan, three from Germany, and three from Britain.

The timing of the crash prompted speculation that a stray Iranian missile may have downed the plane.

Ukraine International Airlines all but discounted pilot error and said the 3-year-old plane had been inspected on Monday.

“Given the crew’s experience, error probability is minimal,” said vice president of operations Ihor Sosnovsky. “We do not even consider such a chance.”

The airline uses the airport “to conduct training on Boeing 737 aircraft aimed at evaluating pilots’ proficiency and ability to act in emergency cases,” he added.

The crew was led by Capt. Volodymyr Gaponenko, who had 11,600 hours on the 737, 5,500 of them as captain. He was joined by first officer Serhii Khomenko who had 7,600 hours on a 737 and instructor pilot Oleksiy Naumkin, who had 12,000 hours on the 737, with 6,600 as captain, the airline said.

Uncertainty over investigation

Under international law, the country where the crash took place leads the accident investigation but other countries often aid in the probe. Because the plane was a U.S.-made Boeing airliner, U.S. government officials and Boeing would normally be involved but tensions between the two countries called that into question.

Iran has recovered a black box from the crash site but it’s unclear whether the country would send it to another country to be analyzed, Reuters reported.

GP: Ukrainian plane crash in Iran
Rescue workers and forensic investigators inspect the bodies of victims of a Ukrainian plane crash. airport, killing all onboard. Mahmoud Hosseini | picture alliance | Getty Images 

Ukrainian President Volodymyr Zelensky has also reportedly instructed the country’s prosecutor general to open criminal proceedings over the air crash, according to Reuters.

The 737-800 plane is not a 737 Max, the type that regulators grounded worldwide in March after two fatal crashes in a span of five months, sending Boeing into its biggest crisis in its more than 100-year history.

Ukraine International Airlines received the 737-800 jet in 2016 when it was new, according to Flightradar24, a flight-tracking site. Flight 752 stopped transmitting location data about two minutes into the flight, it added.

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Rescue workers carry the body of a victim of a Ukrainian plane crash. Mahmoud Hosseini | picture alliance | Getty Images 

In a phone interview with the heads of the Civil Aviation and Emergency Management in Iran, state TV reported that the crash site was in Shahriar, near Tehran. Emergency services said the fire at the crash site was so intense that they had to briefly halt rescue efforts.

Ukraine International says it has 42 planes in its fleet and operates 1,110 flights a week. The airline did not immediately respond to a request for comment and more information.

“This is a tragic event and our heartfelt thoughts are with the crew, passengers, and their families,” Boeing said in a statement. “We are in contact with our airline customer and stand by them in this difficult time. We are ready to assist in any way needed.”

The engine-maker, CFM International, a joint venture of General Electric and Safran, said it was premature to speculate on the cause of the crash. Approximately 14,000 CFM56-7B engines are in service which have logged more than 400 million flight hours and the model is a staple of the Boeing 737NG fleet around the world.

“We are deeply saddened by the loss of Ukraine International Airlines Flight 752. We extend heartfelt sympathies to the families and loved ones of those on board,” GE said in a statement.

The most fatal 737-800 crash was an Air India Express flight from Dubai in 2010 that killed 158 of the 166 people on board when it tried to land in Mangalore, according to the flight safety foundation. In 2016, a FlyDubai 737-800 crashed while trying to land in Rostov-on-Don Airport in southern Russia, killing 62 people on board.