Facebook's trending news algorithm failed to detect a hoax story related to the 9/11 attack, which was trending on the social media platform this past week.

Facebook recently announced that it has replaced the human editors behind its trending stories with an algorithm. However, Facebook maintained that it would still have people involved in the process to make sure the links posted remained "high-quality."

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The incident has led many to question why Facebook's algorithm was not able to filter out the fake story.

On Friday, the algorithm Facebook uses to select trending stories placed a story from the Daily Star on top of the list. The story about the 9/11 attack claimed that the Twins Towers fell because of bombs planted within the buildings, instead of a terrorist attack.

The hoax post was swiftly removed once Facebook was informed of the situation.

A Facebook spokesman in a statement said, "We're aware a hoax article showed up there and as a temporary step to resolving this we've removed the topic.''

Although 9/11 was added back to Facebook's trending news list, this was because it was a widely searched topic among people marking the 15^th anniversary of the horrible tragedy.

This was the second blunder of its kind at Facebook since the social network replaced its trending news team with an algorithm in August.

Facebook hs declined to comment on how its quality control team missed the fake links before it was posted on its popular trending section.