The French prime minister's office has admitted to tipping off prosecutors about possible leaks to the website Mediapart - whose offices police attempted to search on Monday.
It's generated a major row about the journalists' right to keep their sources private - in a case that could prove very embarrassing to the French President.
Elena Casas reports from Paris.

US says it killed four people in strike on vessel in Caribbean
Saudi civil defence sends all-clear after alerts issued for capital Riyadh
11 Syrian soldiers killed in weapons depot explosion
Number of people displaced worldwide falls, UN says
White House turns away reporters after Trump's ban
