TORONTO – Worldwide tributes to those killed in the deadly attack on the offices of French satirical magazine Charlie Hebdo Wednesday have made Twitter history.

With over 3.4 million tweets over two days, the hashtag #JeSuisCharlie is now one of the most popular hashtag in Twitter history, according to the social media site.

#JeSuisCharlie (I am Charlie) began to trend worldwide shortly after Wednesday’s attack, which left 12 people dead and 11 others injured. The hashtag has been trending both worldwide and in Canada since.

According to Twitter Data, by 7:15 p.m. Paris time on the night of the shooting, there had been 2.1 million tweets sent using the hashtag. At one point in the evening the hashtag garnered 6,486 tweets per minute, according to Twitter France.

By Thursday, over 3.4 million tweets had been published worldwide, according to Twitter France.