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Search giant Google has promised to do all it can to block child abuse images in search results.

The firm said it had more than 200 people working on the problem, putting various things into place to make child sexual abuse images harder to find. The introductions to its popular search engine include cleaning up results for certain searches and pop-up warnings. See also: UK's PM warns Internet companies to ban child abuse search terms.

Google executive chairman Eric Schmidt told the Daily Mail: "We've fine tuned Google Search to prevent links to child sexual abuse material from appearing in our results."

"While no algorithm is perfect – and Google cannot prevent paedophiles adding new images to the web – these changes have cleaned up the results for over 100,000 queries that might be related to the sexual abuse of kids. As important, we will soon roll out these changes in more than 150 languages, so the impact will be truly global."

Microsoft has also said its Bing search engine will also produce clean results and Schmidt said "Microsoft deserves a lot of credit for developing and sharing its picture detection technology".

Read: Microsoft adds child abuse search pop-ups to Bing.

Google and charities will show warnings at the top of search results for more than 13,000 queries. They will inform the user that child sexual abuse is illegal and also offer advice on where to get help.

The search provider said that computers aren't reliable when it comes to detecting abuse imagery compared to something innocent so images have to be reviewed by a person. Abusive imagery is given a unique digital fingerprint.

Offenders are increasingly filming their crime so engineers at YouTube have created a new technology to identify these videos. Google plans to make it available to other internet companies and child safety organisations in the new year.