LONDON — Security was unusually tight at the traditional kickoff to the English football (soccer) season held at Cardiff’s Millennium Stadium in early August, just a month after four bombs exploded in London, killing 50 commuters, as it has been in all U.K. venues.

Hundreds of police officers were on the streets of the Welsh capital before and after the Community Shield match between two of London’s leading clubs, Chelsea and Arsenal Aug. 7. A team of 800 stewards (in-...

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