In 2018, YouTube introduced a system that would automatically add information boxes to videos that its algorithms determined may present conspiracy theories and other fake news, filling the infobox with content from Encyclopedia Britannica and Wikipedia as a means to inform users to minimize misinformation propagation without impacting freedom of speech. In the wake of the Notre-Dame de Paris fire on April 15, 2019, several user-uploaded videos of the landmark fire were flagged by YouTube' system automatically with an Encyclopedia Britannica article on the false conspiracy theories around the September 11 attacks. Several users complained to YouTube about this inappropriate connection. YouTube officials apologized for this, stating that their algorithms had misidentified the fire videos and added the information block automatically, and were taking steps to remedy this.