“If countries should decide to take different paths… you have to be ready to say then, we'll have to reintroduce border controls. We don't want that, we want to find an agreement with our partners, but we can't have that (infections) just coming because other countries are taking another path,” she said.
Merkel noted that consultations are already going on with the Czech Republic and Luxembourg, as many cross-border workers — some working in key industries like healthcare — travel back and forth daily.
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She said she would seek a set of common measures, for instance on regular virus tests, during an EU summit on Thursday.
Merkel spoke following an hours-long meeting with Germany's 16 state premieres in order to tighten and extend the current shutdown until at least February 14th.