Led by the Osaka Prefectural Police, authorities have thoroughly prepared security systems for the World Expo, which opens on Osaka's human-made Yumeshima island on Sunday.
The authorities will deploy up to 10,000 personnel for Saturday's opening ceremony, including special units from police departments across the country.
During the 184-day event, police will have to step up security for this summer's Upper House election, while also preparing in the event of a natural disaster.
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