Turkish football bosses suspended all leagues after a referee was punched to the ground by a club president following a top-flight game on Monday.
Halil Umut Meler was struck by MKE Ankaragucu president Faruk Koca, who ran on to the pitch after his team conceded a 97th-minute equaliser in a 1-1 Super Lig draw with Caykur Rizespor.
“The matches in all leagues have been postponed indefinitely,” Turkish FA [TFF] chairman Mehmet Buyukeksi said in a news conference.
“This attack is a night of shame for Turkish football,” he added.
Meler received several blows from others as he lay on the turf and suffered injuries including a minor fracture.
The incident sparked chaotic scenes involving players and club officials.
Koca required treatment in hospital but “detention procedures will be carried out after the treatment”, said Turkey’s minister of internal affairs, Ali Yerlikaya.
Yerlikaya added others had been arrested for their part in the incident, which he “strongly condemned”.
Meler, 37, is one of Turkey’s top referees and officiates international games for Fifa. He is also on Uefa’s elite referee list.
He also required hospital treatment and the chief physician of the hospital where he was treated, Dr Mehmet Yorubulut, said: “There is no life threat for the moment. He only has bleeding around his left eye and a small fracture.
“We will [monitor] our referee until the morning due to head trauma. We will discharge him from hospital after the necessary examinations in the morning.”
The country’s president, Recep Tayyip Erdogan, spoke out after the shocking scenes. “I condemn the attack on referee Halil Umut Meler after the MKE Ankaragucu-Çaykur Rizespor match played this evening, and I wish him a speedy recovery,” he said.
“Sports means peace and brotherhood. Sport is incompatible with violence. We will never allow violence to take place in Turkish sports.”
Home club MKE Ankaragucu expressed regret following their president’s actions, saying in a statement: “We are saddened by the incident that took place this evening.
“We apologise to the Turkish football public and the entire sports community for the sad incident that occurred after the Caykur Rizespor match at Eryaman Stadium.”
Caykur Rizespor sent a message of support to Meler and expressed general dismay, stating: “We strongly condemn the undesirable events that occurred after the Ankaragucu match we played today.
“We convey our wishes to the entire referee community, especially the referee of the match, Halil Umut Meler, to get well soon.”
The TFF chose to take a decisive course of action that it hopes will lead Turkish football to become a safer place.
TFF chairman Buyukeksi added: “Football matches are not a war, there is no death at the end. Not all teams can become champions at the same time. We all need to understand this. We invite everyone to take responsibility.
“[Ankaragucu] and its managers will be punished most severely.”
He said the penalties will be discussed in the relevant decision-making committees starting on Tuesday.
Galatasaray, one of the country’s biggest teams, had earlier called for an emergency meeting to allow clubs to address what they say is a growing issue in the Turkish game.
“We must all come together today and act to solve the problems we are a part of,” read a Galatasaray statement.
The Association of Active Football Referees and Observers of Turkey called on all referees not to take the fields, adding: “The violent attack on Meler was not only against our referee Halil Umut Meler but also against the entire referee community.”
The Turkish Super Lig Professional Football Clubs Foundation condemned the attack and said clubs were “ready to take all steps to prevent violent incidents”.