It was less than a month ago that a couple atheist bus ads went up in Kelowna, British Columbia:

All of a sudden, with two weeks left to go on their contract, the two ads have just “disappeared”…
Executive Director with the Centre for Inquiry says he’s been told by Lamar Advertising, it was a professional hit.
“They weren’t simply ripped off or graffitti. Apparently, to their knowledge, this has never happened before.”
The two buses were parked in a bus yard that has security around the clock.
According to a press release from CFI – Vancouver:
Jamie Williams, Executive Director of CFI Vancouver, commented: “The amount of effort put into this demonstrates how necessary the campaign is. We’re not asking that people agree with us, just that they respect our right to be heard.”
There’s no word on who the culprits are… but I would hope Lamar Advertising replaces them at no extra cost to the Center for Inquiry. If CFI has to bear the cost for a replacement ad, it’d be great PR for a local church to raise money for the effort (“We may disagree with them, but we are appalled that anyone would do this. They have a right to their beliefs just as we do”).
Now, let’s see those security tapes…
(Thanks to Loren for the link)
***Update***: Crommunist at Canadian Atheist writes:
To add further insult to injury, Lamar — the advertising company responsible for creating and posting the ads — has told CFI Canada that the responsibility to replace the missing billboards is theirs. This, after being told that any vandalism to the signs would result in their immediate removal, reeks of the most egregious hypocrisy. Apparently in the ideological conflict between those who stand for the legal right to free speech and those that would silence dissenting minority opinions through illegal acts of censorship, Lamar has decided to side with the vandals…