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Two people suspected of leaking CCTV footage of Matt Hancock's affair with Gina Coladangelo have had their homes raided.
Officials from the Information Commissioner's Office searched two properties in the south of England on Thursday and seized electronic devices including mobile phones and computers.
But there have been calls for the investigation, centred on alleged data breaches, to be escalated to a full criminal inquiry headed by a major police force.
Police and crime commissioners said the matter went to the heart of national security and insisted it was vital it was investigated thoroughly to ensure ministers could do their jobs without fearing they were being spied on.
Mr Hancock was forced to resign as Health Secretary last month after footage of him sharing an embrace with Ms Coladangelo, one of his paid officials, was leaked to The Sun.
The footage is understood to have been captured by a CCTV camera inside Mr Hancock's office, which was allegedly viewed and recorded by a member of the Department of Health and Social Care's (DHSC) security team. The footage was subsequently shared with journalists.
The Information Commissioner's Office, which investigates data breaches. was called in by EMCOR Group (UK) plc, the company that provides the CCTV network at the DHSC, in a bid to identify those responsible.
Steve Eckersley, the director of investigations at the ICO, said: "It's vital that all people, which includes the employees of government departments and members of the public who interact with them, have trust and confidence in the protection of their personal data.
"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 and will not be commenting further until it is concluded."
A spokesman for EMCOR said: "We can confirm that we submitted a breach report, as the Department of Health and Social Care's data processor, alleging images were recorded from the Department of Health and Social Care CCTV system without consent.
"EMCOR UK takes the security of its data and that of its customers very seriously and we are fully co-operating with the ICO's investigation."
It is understood the Met Police accompanied the ICO officials on the raids on Thursday morning. The electronic devices seized by officials will now be examined in an effort to establish whether any laws were broken.
If a person is convicted under section 170 of the Data Protection Act the courts can impose an unlimited fine.
Several newly-elected PCCs said it was time for a police force to take over the investigation because the implications of the security breach were so serious.
Marc Jones, the chairman of the Association of Police and Crime Commissioners, said: "If we can't keep our own government buildings secure then that has implications. It is really important that this is dealt with appropriately and professionally and that the Government can have the confidence that it can go about its business on all of our behalf."