Speaking to the Evening Standard, Chief Superintendent Mick Johnson, who was the match commander, said: "Picking them out is one of the difficulties we face in terms of taking this forward. The chap who was arrested shouted in an officer's face, so it was fairly easy.
"Another man stood on his own and started singing the 'Y' word, so he was approached and warned and took on board what the officer said. The plan was quite straightforward."
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The 47-year-old man died shortly after 3pm on Tuesday.
Specialist explosive detection dogs searched through the town examining letter boxes and phone booths for signs of potential devices.
Temperatures reached 29.1C in St James's Park, central London.