Hassan Rezaeifar was quoted by the state-run IRNA news agency as saying “the flight recorders from the Ukrainian Boeing are in Iranian hands and we have no plans to send them out.”

He said Iran is working to recover the data and cabin recordings, and that it may send the flight recorders – commonly known as black boxes – to Ukraine or France. “But as of yet, we have made no decision.”

The same official was quoted by the semi-official Tasnim news agency on Saturday as saying the recorders would be sent to Ukraine, where French, American and Canadian experts would help analyze them. Iranian officials previously said the black boxes were damaged but are usable.

It was not immediately possible to reconcile the conflicting accounts. Iran may be hesitant to turn over the recorders for fear that more details from the crash – including the harrowing 20 seconds between when the first and second surface-to-air missiles hit the plane – will come to light.

The Guard’s air defenses shot the plane down shortly after it took off from Tehran on Jan. 8, killing all 176 people on board. Hours earlier, the Guard had launched ballistic missiles at U.S. troops in Iraq in response to the U.S. airstrike that killed Iran’s top general in Baghdad. Officials say lower-level officers mistook the plane for a U.S. cruise missile.

Iranian officials initially said the crash was caused by a technical problem and invited countries that lost citizens to help investigate. Three days later, Iran admitted responsibility after Western leaders said there was strong evidence the plane was hit by a surface-to-air missile.