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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Labour strongholds tended to remain so - apart from a major loss for the party in Dudley.
Labour suffered a "terrible" defeat in Rhondda but has already won 16 Welsh Assembly seats as it looks to record a fifth term in office.
UKIP have made further gains in the local elections in the Anglia region and the Conservatives have won back control in Peterborough.