"It was enough of a concern that the North American Aerospace Defense Command -- better known as NORAD -- called the Canadian government to let them know that a piece of space debris was headed towards Calgary.
And the debris was big: a piece of an unmanned Russian rocket, 10 square metres in size."
- http://www.ctv.ca/servlet/ArticleNews/story/CTVNews/20090214/debris_calgary_090214/20090214?hub=SciTech
