Prime Minister Justin Trudeau held a news conference Wednesday to talk about the crash of a Ukrainian airlines jet that killed all aboard, including at least 63 Canadians. He said it's too soon to speculate about the cause of the crash, which occurred immediately after take-off from Tehran airport late Tuesday - just hours after Iran launched missile strikes on two military bases in Iraq. Trudeau says he can't rule out that the plane was brought down by an Iranian missile.