Four police officers were injured as trouble broke out in Newcastle city centre following shock Sunderland's 3-0 win at St James' Park.
Bottles were thrown and bins set on fire as mounted officers tried to move crowds back to allow visiting fans to be escorted to Metro and rail services.
Northumbria Police said 29 arrests were made during the game itself.
A spokesman said officers were studying CCTV footage of the city centre to identify the troublemakers.
There was disruption to Metro services while police restored order.
A British Transport Police spokesman said three of its officers were injured while Northumbria Police said one of its officers was also hurt.None of the officers are thought to be seriously injured.
Police said Sunderland fans travelling on official coaches had safely returned to Wearside.Fans had been warned prior to the game that any incidents would be firmly dealt with.
These incident will almost certainly see the club have to answer awkward questions about their fans behaviour and does nothing for football's reputation following so closely onto the incidents at the FA Cup semi-final between Millwall and Wigan.
Millwall boss Kenny Jackettcame out and apologised for the behaviour of some of the club's fans after fighting marred their 2-0 FA Cup semi-final defeat by Wigan. Speaking on ESPN immediately after the game, Jackett was unaware of the incidents.
But television pictures showed a young girl crying following the trouble and Jackett said: "I'm very, very sorry if that's the case."
Jackett stressed that the Londoners are determined to stop their fans causing trouble.
"We are trying to progress. We want to try very hard to keep the momentum of the club going forward," Jackett said.
"[The violence] will hold us back as we are trying to find the equation to keep the momentum going forward on the pitch. That will hold us back if it happens repeatedly.
"We have worked very hard. The chief executive and the board of directors have worked very, very hard to do everything possible to make us trouble free. We have had many, many high-profile games where things have gone very well.
"Our work in the community and the work of our players in the community is considerable. We are doing everything possible to continue this and to help the profile of the club in the south London community."