Technology companies must go “further and faster” in removing extremist content, Prime Minister Theresa May is to tell the United Nations.
She will urge social networks and search engines to act when she addresses the general assembly.
Mrs May will also host a meeting with other world leaders and firms including Facebook, Microsoft and Twitter.
Separately, tech giant Google has said it will give a total of £1m to fund counter-terrorism projects in the UK.
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The prime minister has repeatedly called for an end to the “safe spaces” she says terrorists enjoy online.
Ministers have called for limits to end-to-end encryption, which stops messages being read by third parties if they are intercepted, and measures to curb the spread of material on social media.
On Wednesday, the prime minister will hail progress made by tech companies since the establishment in June of an industry forum to counter terrorism.
But she will urge them to go “further and faster” in developing artificial intelligence solutions to automatically reduce the period in which terror propaganda remains available, and eventually prevent it appearing at all.
The UK, France and Italy are to call for a target of one to two hours to take down terrorist content wherever it appears.
READ MORE: http://www.bbc.com/news/uk-politics-41327816