The parents of murdered schoolgirl April Jones have criticised David Cameron for failing to clamp down on online images of child abuse.
Paul Jones accused the Prime Minister of reneging on a vow to take tough action on blocking internet images of abuse.
Jones told Channel 5 News: "I think he's hoodwinked us a little bit by coming out banging the drums, but hasn't actually put any money in place - he's left it to the internet (companies)."
He added: "When I last met David Cameron I said aim high - but he's fallen well short of the mark."
Last July, Cameron threatened to impose tough new laws on internet giants if they fail to blacklist key search terms for horrific images as part a crackdown on online porn unveiled today.
In November, Google and Microsoft promised to introduce new software that will automatically block 100,000 "unambiguous" search terms which lead to illegal content.
Coral and Paul Jones launched the campaign after Mark Bridger was found guilty of their daughter's abduction and murder last year.
Proposals to restrict underage access to pornography are doomed to failure, an anti-censorship group has warned.
Video-on-demand regulator ATVOD wants to forbid credit and debit card operators from processing payments on websites that do not offer age checks.
But Sex and Censorship, a group that campaigns for "free speech and sexual freedom", says the watchdog's own research shows the most popular adult site for underage users doesn't require users to pay or enter card details.
In a blog for the group, adult producer Ben Yates wrote: "Of course, this proposal, along with many other Government-backed ideas on stopping children watching porn, simply fails before it begins.
"Tube sites and forums don’t require payment or age verification and present streaming hardcore [pornography] almost immediately," he added.
Credit card companies have no plans to block payments to websites that lack age restrictions, ITV News' Consumer Editor Chris Choi reports:
Age checks should be carried out by pornography websites before granting access to users, an industry regulator said.
Laws need to be changed in order to protect children from seeing adult material on the internet, online video regulator Atvod, the Authority for Television on Demand, said.
Research for Atvod found that 6% of children aged 15 or under had accessed an adult website over the course of a month.
One pornography website was visited by 112,000 boys in the UK aged between 12 and 17, while some 5% of visitors to adult sites were under 18.
The statistics emerged after the online habits of 45,000 desktop computers and laptops were monitored over a month, with volunteers reflecting a cross-section of the population.