Pharmaceutical giant GlaxoSmithKline is under criminal investigation here in the UK, the company said.
The London-based multinational corporation said the Serious Fraud Office has opened a "formal criminal investigation".
The company is facing similar investigations in Iraq and China.
More top news
The move comes amid a motion of no confidence that was tabled against Labour leader Jeremy Corbyn.
The first anniversary of the Sousse terrorist attack - which left 30 Britons dead - will be marked by families of the victims on Sunday.
Since Friday's EU result, the Liberal Democrats have recorded thousands of voters signing up to become members.