City officials launched an investigation after the fan was hit flash during Newport game.
It was thrown after second goal from the top tier of Cop and landed on supporter below.
AT club looking for witnesses to identify those responsible. They are also reviewing CCTV footage and hopefully providing West Yorkshire Police with images to further identify suspects.
The statement said that these found responsible will face indefinite ban on entry to all cities games – how will it be anyone associated with the incident.
Mayor Ryan Sparks said: “Given our history and how much of our fans got through it together, it was terribly disgusting to see pyrotechnics inside Valley Parade yesterday.
“After our club survived, it’s disgusting to think one of our own supporters show such neglect for our history and such disrespect for like-minded people.
“Yesterday’s events will undoubtedly affect a number of of people who we made testify to them. For this, on on behalf of of in football clubI would like apologize.
“It is incredibly frustrating to discuss this kind of of behavior so early in new season, given the recently released allegation of misconduct on game day and its aftermath – both in terms of in clubfinance and reputation.
“When we find those responsible, they will face strongest-possible action and we call anyone with information to step forward and help with our investigations.
Now the city can face sanctions from the Football Association, who will want full Details of Incident.
Anyone who has further information you can email [email protected] or call 01274 773355 (ext. 223).
