<span style="color: #222222;">Canadian investigators  will access the wreckage and black boxes from a Ukranian jetliner downed by a missile strike last week.   Transportation Safety Board of Canada, chair Kathy Fox said, they have been invited by Iran, which is leading the crash probe, to participate in the downloading and analysis of the aircraft's cockpit voice and data recorders. She said, that they will also be allowed to visit the crash site.<br />'' <br />'' The Ukraine International Airlines Boeing 737 was shot down by a missile shortly after taking off from Tehran before dawn last Wednesday, killing all 176 passengers and crew on board.<br />'' <br />'' Fifty-seven of the victims were Canadian.</span><br />