A terrorist bomb-making video watched by Salman Abedi before he blew himself up at a Manchester pop concert is still being shared on YouTube, the US Senate has heard.

A senate committee questioned how the video was getting round the web giant’s safeguards designed to stop extremists posting propaganda and terrorist content.

The video has been uploaded to the site as recently as this month, the committee disclosed as they quizzed executives from the world’s top social media companies.

Executives from Twitter, Google’s YouTube and Facebook said their automatic tools for spotting and quickly removing the content were becoming increasingly effective. But senators said the efforts were still “not enough”.

Sen John Thune, chairman of the commerce committee, said: “According to the Counter Extremism Project, one single bomb making video used to instruct the Manchester suicide bomber has been uploaded to YouTube and removed 11 times but continues to resurface as recently as this month.

“How is it possible for that to happen?”