A Ministry of Defence (MOD) contractor has confirmed it has been the target of a cyber attack.
Outsourcing giant Interserve holds a range of construction deals with the Government and said some of its services could be impacted as a result of the incident earlier this month.
Last year, the firm was given a contract extension worth up to £500 million to provide infrastructure support to overseas UK military bases in Gibraltar, Cyprus, Ascension Island and the Falkland Islands.
It recently helped with the construction of the NHS Nightingale Birmingham Hospital.
In a statement, the firm said: “Interserve is working closely with the National Cyber Security Centre (NCSC) and Strategic Incident Response teams to investigate, contain and remedy the situation.
“This will take some time and some operational services may be affected.
“Interserve’s employees, former employees, clients and suppliers are requested to exercise heightened vigilance during this time.”
The Information Commissioner said it was aware of the incident and that it would “assess the information provided”.
An NCSC spokesperson said it is working with Interserve "to understand its impact and advise on mitigation".
Construction firm BAM Construct UK also confirmed it has been the subject of a "significant cyber attack".
Like Interserve, BAM Construct was also involved in the construction of the NHS' Nightingale emergency hospitals, helping to set up the facility in Harrogate.
Last week, the NCSC and the US Cybersecurity and Infrastructure Security Agency said they believe criminals were targeting such organisations in the hope of gathering sensitive information related to the coronavirus outbreak.
Cover image: MOD.