Vancouver MP Don Davies quickly deleted a tweet he posted Wednesday after the building housing the Prime Minister's Office was evacuated due to the discovery of a suspicious package.
But not before the tweet was seen by many on the Hill and drew criticism ranging from "despicable" to "the worst tweet in Canadian politics today".
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After deleting the message about 10 minutes after posting it, the NDP MP tweeted an apology of sorts.
More Twitter reaction in slideshow below: