Iran said on Sunday it was trying to analyse the black boxes of a Ukrainian airliner that its military shot down this month, denying a report that a decision had been taken to send the voice and flight data recorders to Ukraine, reported Reuters. Canada, which had 57 citizens on the January 8 flight in which all 176 aboard were killed, said on Sunday there were still no firm plans for downloading the recorders. Ottawa and other capitals have called for the black boxes to be sent abroad. The plane disaster has heightened international pressure on Iran as it grapples with a long-running dispute with the United States over its nuclear programme and its influence in the region that briefly erupted into open conflict this month. The military has said it downed Ukraine International Airlines flight 752 in error in the aftermath of tit-for-tat strikes by the United States and Iran. But authorities delayed admitting this, prompting days of protests on Iran’s streets. “We are trying to read the black boxes here in Iran. Otherwise, our options are Ukraine and France, but no decision has been taken so far to send them to another country,” Hassan Rezaifar, a director in charge of accident investigations at Iran’s Civil Aviation Organisation, told state news agency IRNA. Rezaifar had been quoted by Iran’s semi-official Tasnim news agency on Saturday as saying the black boxes could not be decoded in Iran and would be sent to Ukraine after Kiev’s repeated requests. IRNA also reported on Sunday that the official had made similar comments a day earlier. It was not immediately clear what prompted Rezaifar to backtrack. The Boeing 737-800 was en route from Tehran to the Ukrainian capital. Most of those on board were Iranians or dual nationals. Canada’s Transportation Safety Board said in a statement two of its investigators left Tehran on Sunday after a six-day visit during which they examined the wreckage. It said Iranian investigators were “cooperative and helpful” but said there were still no firm plans on how and when the black boxes would be downloaded.