Bohemians will ban fans found to have thrown flares onto the Richmond Park pitch during Friday night's Dublin derby with St Patrick's Athletic.
Bohs player Cian Byrne was struck by a flare and required medical treatment while the game was delayed.
The club also say some fans have reported being struck by flares thrown by members of the away support.
"Bohemian FC condemns unequivocally the actions of individuals within our support base during Friday’s SSE Airtricity Men’s Premier Division game away against St Patrick’s Athletic," a statement reads.
"These incidents, when multiple flares were thrown onto the pitch at the start of the second half, represented an unacceptable and reckless escalation of behaviour that endangered the safety of players from both teams and the safety of our own supporters.
"Bohemian FC players required medical attention after being struck by the flares, while we have received reports from our own supporters of being struck by flares thrown in the direction of the pitch.
"There can be no justification of this. We have consistently reminded members and supporters of the collective responsibility of all in attendance at our games to help create an atmosphere and environment where supporters feel safe.
"All supporters should by now be well aware of the potential consequences and league sanctions for clubs when incidents of this nature occur.
"It is therefore extremely frustrating for the overwhelming majority of our fanbase that a small number of individuals proceeded to wilfully behave in this way regardless of the potential consequences for the club and supporters.
"We take their actions extremely seriously, and the club is now in the process of reviewing all available footage and photographs
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