
Microsoft's Bing search engine has become the first to introduce pop-up warnings for people in the UK who seek out online images of child abuse.
The notification will tell them the content is illegal and provide details of a counselling service.
It comes after the prime minister said internet companies needed to do more to block access to such images.
Yahoo, which uses Bing's technology on its search page, said it was considering a similar move.
Google is not planning to use pop-ups but said it would continue to report material and help experts combat the problem.
The debate about online images showing the sexual abuse of children has come to prominence after two high-profile murder trials heard how the killers searched for them.
Bing's pop-up warning, which applies to searches conducted in the UK, is triggered when people enter words on a "blacklist" compiled by the Child Exploitation and Online Protection Centre (Ceop).
Microsoft said the notifications aimed "to stop those who may be drifting towards trying to find illegal child abuse content on the web via search engines".
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I highly doubt these pop-ups are going to make any difference at all.
What do you think?