More than 1,000 Blues supporters invaded the pitch after their side's 2-1 win at St Andrew's and confronted the 3,800 Villa fans situated in the Gil Merrick Stand at the other end of the stadium.
A flare appeared to be thrown into the section housing the Villa supporters although it was then tossed backwards and forwards between the rival factions. Seats were also ripped out and used as missiles along with other objects.
The FA described the incidents as "serious crowd disturbances" and have given Blues until Friday March 11th to respond.
Blues said in a statement they "would like to thank the FA for their assistance and communication prior to and during the investigation".
Source: PA
Source: PA