(Reuters) — Web giants YouTube, Facebook, Twitter and Microsoft will step up efforts to remove extremist content from their websites by creating a common database.

The companies will share ‘hashes’ – unique digital fingerprints they automatically assign to videos or photos – of extremist content they have removed from their websites to enable their peers to identify the same content on their platforms.

“We hope this collaboration will lead to greater efficiency as we continue to enforce our policies to help curb the pressing global issue of terrorist content online,” the companies said in a statement on Tuesday.

Tech companies have long resisted outside intervention in how their sites should be policed, but have come under increasing pressure from Western governments to do more to remove extremist content following a wave of militant attacks.

Read the rest of the story at Reuters.