Birmingham have been charged by the Football Association after the behaviour of their fans during the Barclaycard Premiership clash with Aston Villa on September 16th.
The Blues won the St Andrews contest 3-0 but supporters got onto the field of play after all three goals - and this has prompted the FA to act.
A statement released by the FA today read: "We can confirm the FA have today charged Birmingham City with breach of Rules E21a and E21b, which respectively deal with the failure to ensure the proper conduct of spectators and to ensure that no spectators encroach onto the field of play.
"The charges relate to the behaviour of Birmingham fans during the derby with Aston Villa at St Andrews. The club have 14 days to respond."
Home supporters cavorted on the pitch in ecstasy after Clinton Morrison had given Birmingham a 31st-minute lead.
And Peter Enckelman's blunder for the home side's second goal after the break brought a repeat, with some home fans taunting the Villa goalkeeper.
Geoff Horsfield rounded off the win seven minutes from time, sparking more jubilant scenes in the first top-flight meeting of the two teams for 16 years.