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The Transportation Safety Board says two investigators are heading back to Canada after six days in Tehran and two in Kyiv, helping probe the downing of a Ukraine International Airlines jet.
Iran has admitted firing surface-to-air missiles at the airliner as it left Tehran's international airport Jan. 8, saying it was a mistake.
Fifty-seven Canadian citizens were among the 176 people killed.
The TSB says it understands the plane's flight-data recorders are still in Iran, while the country's authorities consider how to download and analyze the information they contain.
It says a different set of Canadian investigators will be there "wherever and whenever that activity takes place."
The investigators are still seeking a bigger role in the probe, but the TSB says the Iranian authorities have been co-operative and helpful.
