VIDEO: Salford City fan throws flare at Boston United supporters
Seconds after the Ammies clinched the championship, despite their 2-1 home defeat, the fan can be seen running on the turf with a lit flare.
A steward makes an attempt to stop him but allows the man, dressed in dark clothes and a cap, to continue.
The man then makes his way towards the away end, throwing the flare towards Boston supporters.
Pilgrims players gave chase, before the fan was grappled by a steward.