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The latest disaster confronting Boeing

A 737-800 jet bound for Ukraine crashed in Tehran this morning, killing all 176 people onboard. It’s the latest potential problem for a company that was already deep in crisis. Shares in Boeing were down 2 percent in premarket trading.

An engine caught fire shortly after takeoff and the pilot was unable to regain control, an Iranian government official told the state news media. Ukraine International Airlines, which operated the plane, said that the jet was made in 2016 and had been serviced on Monday.

It’s not clear what caused the crash. The Ukrainian Embassy in Tehran initially suggested that the cause was “engine failure due to technical reasons,” but later said it was too early to draw conclusions.