Investigators have seized electronic devices after searching two homes in relation to the leaked CCTV footage that led to Matt Hancock’s downfall as health secretary.
The Information Commissioner’s Office (ICO) said two raids were carried out in the south of England on Thursday as it investigates an alleged data breach.
Mr Hancock, who remains MP for West Suffolk, was forced to resign as health secretary after The Sun published footage of him kissing an aide, Gina Coladangelo, in his Westminster office.
The embrace was in breach of the social distancing Covid rules Mr Hancock himself had introduced.
The ICO said the EMCOR Group, which provides CCTV services at the Department of Health and Social Care, submitted a breach report alleging the images were taken from the system without consent.
Investigators seized “personal computer equipment and electronic devices” as part of the investigation into breaches of the Data Protection Act.
ICO director of investigations Steve Eckersley said: "It’s vital that all people, including employees and visitors to public buildings, have trust and confidence in the protection of their personal data captured by CCTV.
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"In these circumstances, the ICO aims to react swiftly and effectively to investigate where there is a risk that other people may have unlawfully obtained personal data.
"We have an ongoing investigation into criminal matters and will not be commenting further until it is concluded."
Boris Johnson initially rejected calls to sack Mr Hancock after the scandal broke.
The PM instead said he considered the matter "closed," but later defended his actions stating there was a new health secretary the day after the images appeared.
A second investigation is ongoing into Mr Hancock's alleged use of private email accounts at the Department of Health and Social Care (DHSC).
The Information Commissioner Elizabeth Denham said her office had served notices on the department to preserve evidence relevant to her inquiry.
At the time reports emerged over Mr Hancock's potential use of personal emails, the prime minister’s official spokesperson said: "Both the former health secretary and Lord Bethell understand the rules around personal email usage and only ever conducted government business through their departmental email addresses."
The spokesperson suggested Mr Hancock’s use of a Gmail account was "related to things like diary acceptances".