The father of a teenager who took her own life after viewing harmful content online has said he is "dismayed" by reports the government is to ban young people from using some social media platforms.

Ian Russell, the father of Molly Russell, told the BBC's Laura Kuenssberg, Sir Keir Starmer had "rushed" an announcement and that he could "not think of a reason other than a political reason".

"If he's playing politics, what he's doing is gambling with young people's lives, and I find that deplorable."

A Downing Street spokesperson said: "We have undertaken a thorough consultation and will set out next steps in due course."

They added: "The prime minister has been clear that the status quo is not good enough and we need to do more to protect children.

"This is not about politics - it is about protecting children."

In recent weeks, government ministers have examined a variety of options for restrictions, including a blanket ban on under-16s accessing social media, as has been introduced in Australia.

Some media reports have suggested under-16s could banned from accessing "high-risk" social media platforms under the plans, while safer ones would be subjected to restrictions.

Speaking exclusively to BBC One's Sunday with Laura Kuenssberg programme, Russell said he would be "dismayed" by such a decision.

He told the BBC ahead of the expected announcement: "In opposition, Keir Starmer promised to tighten up the online safety world by regulating better.

"Early last year, father to father, I met with him briefly and he was very concerned - and he promised me he would look into effective solutions to deal with this problem. He seemed concerned.

"But as we sit here on the verge of this announcement, it seems that he's not kept either of those promises."

He said the prime minister had "promised a group of bereaved parents" an announcement could be expected by the summer recess, which falls in mid-July.

Russell also shared new research indicating half of all girls saw high risk harmful content on social media in a week despite the Online Safety Act, according to new figures from his organisation.

A survey of from the Molly Rose Foundation suggested 47% of girls and a third of all teenagers aged 13-17 saw high-risk suicide, self-harm and eating disorder content in a week.

The poll of 1,825 children across the UK, only slightly fewer are seeing harmful content now than immediately before the Online Safety Act came into force - at 34% down from 37%.

The act was passed in 2023 and was meant to ensure children did not view illegal or certain kinds of harmful content online, with rules for social media companies being enforced by media regulator Ofcom.

However, campaign groups including the Molly Rose Foundation have criticised Ofcom's implementation and enforcement of the new regulations.

Russell told the BBC: "I think it's enough to say that we found that in the first year of implementing the production of children measures, Ofcom the regulator have effectively achieved nothing much at all."

"It's really frustrating because we've been saying... Ofcom have been too timid, Ofcom need to do more, the gaps in the Online Safety Act need to be plugged, something needs to change and very sadly and tragically we seem to have been proved right."

In a statement, Ofcom said it has driven "some of the strongest changes of any online safety regulation in the world".

It said it had brought in age checks and grooming protections for children, as well as investigations into more 100 sites and apps, and fines totalling £5m.

An Ofcom spokesperson said: "The job is far from done and we share Ian's concerns that tech firms have not done nearly enough to reassure parents that they are putting children's safety first. We've made clear that companies need to go much further, including taking swift action to make their feeds safer for children."

See the full interview with Ian Russell on Sunday with Laura Kuenssberg on BBC One at 09:00 BST on Sunday