https://www.bbc.co.uk/news/uk-48051999
The government "cannot exclude" a criminal investigation into leaks from a National Security Council meeting.
Culture Secretary Jeremy Wright condemned leaks to the Daily Telegraph from the meeting about using Huawei technology for the UK's 5G network.
Ex-Defence Secretary Sir Michael Fallon said the matter was "too serious" for a standard leaks inquiry and said the police must be called in.
The National Security Council is made up of senior cabinet ministers.
Chaired by the prime minister, it meets weekly to discuss government objectives concerning national security - with other ministers, officials, and senior figures from the armed forces and intelligence invited when needed.