Opposition leader Svetlana Tikhanovskaya has left Belarus and is “safe” in Lithuania, Lithuanian Foreign Minister Linas Linkevicius says.
Ms Tikhanovskaya’s departure came as protests went on for a second day over Sunday’s disputed presidential poll.
Her campaign team said she was avoiding the protests because of “possible provocations”.
Election results gave President Alexander Lukashenko 80%, but Ms Tikhanovskaya refuses to accept them.
A lack of scrutiny, with no observers present, has led to allegations of widespread vote-rigging in the poll. The US and EU have condemned the vote.
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Mr Lukashenko, in power since 1994, has described opposition supporters as “sheep” controlled from abroad.
Police in Belarus’s capital Minsk fired rubber bullets for a second night to quash protests, and officials say one demonstrator died when an explosive device went off in his hands – the first confirmed fatality since the clashes began.