What's up?

Canada has closed and shuttered it's embassy in Tehran. And then expelled all Iranian diplomats from Canada, under the premise that Iran is a state sponsor of terrorism. The Federal Government has issued a travel warning to Canadians, urging them to stay away from that country.
Foreign Affairs Minister John Baird made the moves Friday morning, declaring Iran "the most significant threat to global peace and security in the world today."

Have you noticed unusual happenings related to Iran lately? I mean unusual within the constant turmoil of these countries? Nor have I, except the regular ongoing condemnation by the West of suspicious nuclear research. 
So it leads me to wonder, why right now?

Is this the result of CSIS having some evidence of ex-pat Iranians up to spying activities in Canada? Usually those kinds of mole discoveries result in expelling a certain few 'diplomats' from a country, never actually closing an embassy in the other country. And they are mostly accompanied by lots of publicity, showing off the prowess of our protective spy agencies.
So what's up?

Or could Canada have received some information from the US CIA that is a precursor of an action that could harm Canadians? Perhaps a military strike is imminent? A bombing raid that could put Canadians at risk? And if the USA wants Canada's support wouldn't they subtly advise us to get the hell out so we have nothing to bitch about? 
The US has had no embassy in Tehran since 1981. After their hostage situation and the Canadian embassy smuggling Americans out. Britain closed theirs last November.
They didn't have the credibility of Canada and many other cool thinking countries in the Iraq war. But that was a war of personal vengeance by George Bush. They should be able to twist a new Iran war into a more noble cause: nuclear proliferation and global peace. 

Or did the Israeli Mossad, after many disagreements with the US over the imminent danger, decide to go it alone and so warn the Canadians?

Or is it about oil? As are so many furtive movements and motives in the Middle East?

Israeli Air Force F16ls

The Israelis have been itching to be let go to send in a couple of planes to put Iran out of the nuclear bomb business. They did it before, in 1981 and 2007. They are ready willing and able but they do want USA support. And wouldn't the US and Israel like to have a little muscle flexing in the area because Egypt seems to be getting a bit fresh and impudent?
And to do an action against Iran in the immediate future, would mean they have all those troops already stationed in Iraq, on the verge of leaving for home. To redeploy a threat force later would be costly. So why not go now?

There is no telling exactly how close Iran is to testing a real nuclear bomb. Once that is done, the newest member of the Destruction Club only needs to screw one onto the tip of a missile capable of hitting Tel Aviv. Presto, new war.
And Iran is accused of helping Syria right now. When the West is trying to neutralize threats to vulnerable Iraq so they can leave with some sense of accomplishment. (One can't help thinking that if they had left Saddam Hussein in place none of this would be necessary.)

President Obama, in his nomination acceptance speech, said the USA was still committed to a free Israel. Is the US getting ready for a preemptive strike? Why is Canada taking this action now? 

Somebody knows something.
What's up?