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."
More top news
Passengers looked horrified as the girl took the potentially lethal shortcut between platforms.
Police were called to Kilburn High Road at 5.20pm after reports of a shooting.
In just 24 hours the offer was retweeted more than a thousand times on Twitter.