Two fans - who were arrested at Villa Park yesterday after a flare was thrown - have been released on bail, according to Sky Sports.
The incident occurred after Andros Townsend gave Tottenham the lead from a cross that nobody touched on its way to the net in the 31st minute.
The flare, which was thrown from the Doug Ellis Stand, hit assistant referee David Bryan on the back of the neck.
The fans in question will not be allowed to attend football matches until November 28, when the bail period ends.
The incident is not isolated - several flares were thrown during England's crucial World Cup qualifier against Poland last Tuesday.
Speaking to Sky Sports, FA secretary Alex Horne emphasised the need for action, but also outlined the difficulty in dealing with such an issue, given that flares are very small and easy to sneak into a football ground.
He said: "We don't like to see it, but they are very small, they are very portable.
"We do our best - it's something we're seeing in a lot of football grounds at the moment.
"We will be doing our own investigation, I'm not sure what FIFA will say."
Tottenham went on to win the match 2-0 and move up to fifth in the Premier League, three points behind leaders Arsenal.
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