The Football Association has announced investigations into two separate incidents of crowd trouble at weekend matches.
Seven people were arrested at Luton on Monday after home fans invaded the pitch and threw missiles including coins at visiting York players, and hurled brooms and mops at police.
There was also trouble at Hillsborough on Sunday where fans clashed on the pitch after the 2-2 draw confirmed Sheffield Wednesday's relegation and Crystal Palace's survival in the Championship.
The FA will contact both clubs and local authorities to collect information and evidence relating to the allegations. FA crowd control advisors were present at both fixtures and their reports into these matters have been received.
An FA spokesperson said: "The FA does not condone disorder either outside or inside football stadia and thankfully such problems remain infrequent in the modern game.
"However, any individuals identified as having taken part in any form of disorder should be dealt with appropriately by the authorities and issued with football banning orders as they simply have no place in our game."