Two men, aged 25 and 27, have been arrested after a flare hit a linesman during the Premier League match between Aston Villa and Tottenham Hotspur at Villa Park, West Midlands Police have said.
Television replays showed a missile being fired from the away section after Andros Townsend's first-half opening goal in Spurs' 2-0 away win.
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It means the petition, calling for a diverse panel to be appointed to the inquiry, has enough signatures to spark a debate in Parliament.