The Austrian Constitutional Court declared the presidential election in Austria invalid because of numerous irregularities and the whole election will now have to take place a second time.
The court found there had been irregularities in 94 out of 117 voting districts.
The election, which took place in May, was narrowly lost by far-right Freedom Party candidate Norbert Hofer.
The Interior Ministry had given Alexander van der Bellen 50.3 per cent of the vote, compared to 49.7 per cent for Hofer, who had run on an anti-immigration platform.
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