The UK communications regulator has announced its first investigation under the new digital safety laws with an inquiry into an online suicide forum.

Ofcom is investigating whether the site breached the Online Safety Act by failing to put in place adequate measures to shield its users from illegal content.

The law requires tech platforms to tackle illegal material – such as encouraging suicide – or face the threat of fines of up to £18m or 10% of global revenue. In extreme cases, Ofcom also has the power to block access to a site or app in the UK.

Ofcom, which is not naming the forum under investigation, said it was focusing on whether the site had put appropriate measures in place to protect UK users, whether it had failed to complete an assessment of the harms the site could cause, as required under the legislation, and whether it had responded adequately to a request for information.

“This is the first investigation opened into an individual online service provider under these new laws,” said Ofcom.

The BBC reported in 2023 that the forum, easily accessible to anyone on the open web, had been connected to at least 50 deaths in the UK and had tens of thousands of members with discussions including methods of suicide.

Last month, obligations came into force under the act requiring the 100,000 services under its scope – from small sites to big platforms such as X, Facebook and Google – to implement safeguards that take action against illegal harms. The legislation lists 130 “priority offences”, or illegal content, that tech companies must tackle as a priority by ensuring their moderation systems are set up to deal with such material.

“We’ve been clear … that failure to comply with the new online safety duties or adequately respond to our information requests may result in enforcement action, and that we would not hesitate to take swift action where we suspect there may be serious breaches,” said Ofcom.