Newcastle have vowed to ban for life fans caught causing trouble in the wake of the derby defeat by Sunderland.
The Magpies have released a statement in which they said they were "embarrassed and appalled" by the behaviour of those involved in the disturbances after Sunday's 3-0 Barclays Premier League defeat at St James' Park.
It said: "We were embarrassed and appalled by the behaviour of a minority of so-called fans who last night were involved in disturbances and disorder in Newcastle city centre after the match."
The statement continued: "Newcastle United have been working with Northumbria Police, and will continue to do so, in order to identify all of the individuals concerned.
"The club will take the strongest possible action against those involved in the disturbances and will impose immediate lifetime bans on all those found guilty.
"These deplorable individuals have no place at Newcastle United and bring shame on the club and the vast majority of its proper, law-abiding fans."
A total of 29 arrests were made after pockets of violence broke out in the city centre after the game.
Video footage showed some supporters throwing bottles at police, while one man was photographed apparently aiming a blow at a police horse.
Bud, of West Yorkshire Police's mounted section, was back home in his paddock on Monday safe and well after the suspected attacker was wrestled to the ground by officers, and Northumbria Police said he has been bailed pending further inquiries.