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Coparmex, a Mexican business group, said it had detected “multiple irregularities” in the vote and declared that the new judiciary could hamper investment in Mexico, the United States’ leading trading partner.

In a statement published online, customs officials said they had identified irregularities in one piece of luggage, prompting them to track down the owner.

A newspaper investigation exposed alleged irregularities and an apparent lack of transparency in the sale of the assets, sparking protests organised by young people.

The first attempted murder trial collapsed in October because of what the judge described as a "great irregularity in the jury".

Test takers seeking to practice law in California complained of a litany of technical glitches and irregularities.