Iran is refusing to hand over black box data from the Boeing 737 that crashed over Tehran, as speculation builds that the aircraft was shot down by an Iranian missile.

The Ukraine International Airlines jet went down early Wednesday, killing all 167 passengers and nine crew. The majority of passengers were from Iran and Canada. The crash occurred just hours after Iran attacked two U.S. air bases in Iraq.

According to the company, the Boeing 737-800 was was of their best planes in the fleet, was “in excellent condition” and had undergone scheduled maintenance just two days before the crash.

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