Besiktas and the Turkish Football Association have condemned the terrorists who apparently targeted police with a car bomb outside the Istanbul club's Vodafone Arena.
It brings up the issue - could British stadiums be next?
Around 20 people, mainly riot police officers, were reported to have been injured in the explosion, which took place following Besiktas' 2-1 home win over Bursaspor.
Turkish media reported the explosions were followed by gunshots.
Images posted on social media appeared to show the remains of a burnt-out vehicle, with debris strewn across the road and fires burning in the wreckage.
Besiktas, the Turkish Super Lig champions, released a statement condemning "the terrorists...who attacked our heroic security forces, who provided security for both our supporters and those of our visitors Bursaspor".
The Istanbul-based club added: "We hope that the citizens who were wounded in the attack will have a speedy recovery and that no greater suffering will be experienced.
"We condemn violence and hatred."
The Turkish FA expressed its "tremendous sorrow" at the injuries and condemned the "inhuman brutal terrorist attack".
Reports said the explosion occurred at the exit where Bursaspor fans left the stadium, but the club said supporters had already left the stadium and that none of their fans had been caught up in the incident.
Bursaspor added that they wished the "injured security personnel and citizens a speedy recovery".
Interior Minister Suleyman Soylu was quoted by Turkey's state-run Anadolu Agency as saying: "We have close to 20 wounded. We have no knowledge on the number of dead. We hope that it will not come to that."