Serbia and Albania are facing stiff sanctions after UEFA charged the countries with a number of offences following the abandoned Euro 2016 qualifier in Belgrade.
The match was abandoned after a melee erupted after a mini unmanned drone trailed a pro-Albania flag over the stadium.
UEFA has announced that disciplinary proceedings have been opened against the football associations of both countries.
Serbia have been charged with the throwing of missiles and fireworks, crowd disturbance, invasion of the pitch by supporters, insufficient organisation and use of a laser pointer.
Albania have been charged with refusing to play and the display of an illicit banner.
Both countries are likely to be handed heavy fines and other sanctions, including possible points deductions, when UEFA's disciplinary body hears the case on Oct. 23. Albania faces forfeiting the match and Serbia could play future games behind closed doors, but UEFA is not expected to expel the countries from the competition.
UEFA president Michel Platini has described the incidents in the Partizan Stadium which followed the drone trailing a flag of Greater Albania banner -- which incorporates parts of various other countries including Kosovo -- as "inexcusable."
The flag was hauled down by Serbia defender Stefan Mitrovic and then brawls erupted involving players, officials and fans before English referee Martin Atkinson led the teams off the field with score at 0-0 as disruption in the stands threatened to boil over, with objects being thrown onto the pitch at Albanian players.
Platini said in a statement: "Football is supposed to bring people together and our game should not be mixed with politics of any kind. The scenes in Belgrade last night were inexcusable."
FIFA president Sepp Blatter added: "Football should never be used for political messages. I strongly condemn what happened in Belgrade."
Neither country had requested they be kept apart in the draw, and the other main criteria which could also persuade UEFA to keep them separate -- being involved in an armed conflict and not having diplomatic relations -- did not apply.
UEFA did keep apart Russia and Ukraine, Spain and Gibraltar and Armenia and Azerbaijan.
Albanian supporters had been banned from entering the stadium by UEFA on safety grounds and the match was set against a backdrop of tight security.
Tensions have never been far from the surface between the nations over Kosovo, the province with which both countries share a disputed border and is recognised as independent by the United States and major European Union countries but not by Serbia -- a bone of contention with Albania.
Albania's captain Lorik Cana told Albanian television his players were attacked by stewards inside the tunnel.
The Albania squad returned to a heroes' reception, with up to 3,000 flag-waving supporters gathering outside Tirana's airport to welcome the team home.
Meanwhle, the brother of Albanian prime minister Edi Rama denied allegations he was responsible for controlling the drone in the stadium.
Olsi Rama said: "I've never used a drone in my life, only bought my son a toy helicopter."
The Serbian FA has launched fierce criticism of Albania claiming their team acted with restraint despite being provoked by the "offensive" flag and were then attacked when they tried to remove it from the field.
It said Albania's response to the controversy had been "scandalous" and suggested it had been a "scenario of a terrorist action planned in advance".
The statement said: "Serbian player Stefan Mitrovic managed to catch the flag and, as it can be clearly seen on all the footages, started to fold it as calmly as possible, in order to give it to the fourth official and for the match to be continued. Absolutely all of the Serbian players and officials on the bench were in their seats, calm and without any attempt to show force or rage because of the incident. However, Albanian players acted very aggressively and physically attacked Mitrovic.
"For the truth and justice we will not and do not want to allow the perpetrators who violated football to present themselves as victims."
The statement said the Serbian FA had then asked UEFA to finish the match after emptying the stadium or to replay it this week but the Albania FA refused.
It added: "According to that, we estimate that they are directly guilty for the match abandonment and we expect that UEFA disciplinary bodies will register the match with 3:0 result, in favour of Serbia.
"It is a scandalous fact that the other party, with their 'job well done' is ridiculing not only FA of Serbia and Serbian people but also, we dare to say, UEFA."