Technology giants Apple Inc are to be formally investigated over its tax arrangements in Ireland, the European Commission has said.
Last year it was revealed the company had cut billions from its tax by declaring companies in Cork and not tax resident in any other country.
The EU's competition authority has been looking into corporate tax arrangements in several member states.
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He has asked his followers for help in tracking the man down.
The president said it was a “very sad day for journalism”.
A summit has been pencilled in for February following last year’s icebreaker in Singapore.