Can you help identify these people in the photograph?
The image in this story is from the Luton Town game at Roots Hall and the area has been identified as where the smoke bomb had come from.
We want to identify these people and ask they contact the Club to speak to us about the incident.
You can call us on 01702 304050.
The club are being investigated by the Football Association for the incident and the fact it happened on the day clubs around the country were remembering those who lost their lives in the Bradford fire disaster.
We will be searching home and away fans before entry to Thursday’s game against Stevenage in the play-off semi-final at Roots Hall, kick off 7.45pm