The parents of murdered schoolgirl April Jones have criticised David Cameron for failing to clamp down on online images of child abuse.
Paul Jones said he felt "hoodwinked" by the Prime Minister, who he accused of reneging on a vow to take tough action on blocking internet images of abuse.
Last July, the Mr 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.
He set out a raft of reforms to protect children from ''poisonous'' websites that are ''corroding childhood'', including introducing family-friendly filters that automatically block pornography unless customers choose to opt out.
In November, Google and Microsoft promised to introduce new software that will automatically block 100,000 ''unambiguous'' search terms which lead to illegal content.
But today April's father told Channel 5 News said not enough had been done in the fight.
He said: "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."
Coral and Paul Jones launched the high-profile campaign in the wake of Mark Bridger, 47, being found guilty of their daughter's abduction and murder last year.
Bridger snatched the five-year-old from outside her home on an estate in Machynlleth, Mid Wales, while she was playing out on 1 October, 2012.
The case highlighted the growing problem of internet abuse after the killer was found to have accessed child abuse images online just hours before her death.
As a result, Mr Cameron agreed to meet the parents last year to discuss the problem and how to address the issue.
It comes as online video regulator the Authority for Television on Demand (Atvod) said laws should be changed to protect children from seeing adult material on the internet and called for p ornography websites to carry out age checks before granting access.
A Downing Street spokesman said: "The Prime Minister has personally led an effort to eradicate child abuse imagery from the web, which has seen the setting up of a new National Crime Agency, nationwide child-safe internet filters and the first-ever agreement from the main search engines to block illegal images in the last year alone.
"Of course, there is always more to do, and we are continuing to work with other countries, industry and other groups to look at where further action can be taken."