It was hard to miss New York's commissioner of police on CNN today talking about an apparent incident at the U.S.-Canada border a month ago.

That was one in which Canadian border guards are reported to have stopped a car to question four men inside, only to have two of them exit the car and successfully run away.

As it is being reported in the American media, the men left behind two backpacks containing passports and photos of Times Square in New York, including the military recruitment office that was bombed earlier this week.

The police commissioner told CNN, "Federal officials are going back to take another look and are attempting to speak to Canadian officials about that stop."

But don't ask the folks at Public Safety Canada about what supposedly occurred that day. When CBC News put the question to them — "Did such an incident even happen?" — the answer was that Canada will "collaborate fully" with any U.S. investigation but otherwise it will not confirm or deny such an event even took place.

So, is it possible to simply outrun border guards into the wilds of Canada? Maybe, maybe not. Did it happen just a month ago and are those two still out there somewhere? Maybe, maybe not.

Is Public Safety Canada willing to let Canadians know what happened? Not so far.