A seven-year-old Hull City fan was injured after being struck in the face by a flare that was thrown into the crowd during a Championship match at Barnsley on Saturday.
South Yorkshire Police said it was hunting for a fellow Hull supporter who threw the flare during the team’s away match with Barnsley.
The force said the incident happened shortly before half-time and the child suffered minor injuries.
Officers are reviewing CCTV footage and have urged anyone who knows who was responsible to contact them.
The Championship match ended with Hull beating Barnsley 2-0.
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A non-league match had to be abandoned on Friday after a firework exploded on the pitch and struck one of the players.
Hashtag United posted footage on social media showing the incident during a reserve team match with Concord Rangers on Friday night. Footballer Matas Skrna narrowly avoided serious injury after the firework landed near him on the turf, with the sparks from the explosion striking his legs.
He collapsed to the floor clutching his legs and was surrounded by concerned team-mates.
A further two fireworks landed near the pitch and the match at the Len Salmon Stadium in Basildon, Essex, was abandoned, with Hashtag United’s reserves leading 2-0.
YouTuber Spencer Owen, who founded Hashtag United in 2016, tweeted that “a few inches different and our lad could have been blinded”.
“Yet another reason to add to the list of reasons to sack off fireworks,” he added. “Dog owners know exactly what I’m saying. Glad Matas is ok.”
A club spokesperson said that a volunteer had gone to a nearby house and asked if they could halt their fireworks.
They said the household carried on with their display, which led to the match being abandoned, after which the fireworks stopped.
Another football match was disrupted by fireworks on Friday when Waterford’s game against Shamrock Rovers in the Irish Premier League was temporarily halted.