An Avon and Somerset Police spokesman said: "Two people have been arrested on suspicion of causing death by dangerous driving."
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Kinga Krasuta is 42 weeks pregnant and could go into labour at any time.
The Bolivian government had earlier confirmed Deputy Interior Minister Rodolfo Illanes had been kidnapped and was at risk of torture.
At least one person has died after part of the building collapsed shortly after midnight, according to local reports.