Turkey's deputy prime minister has pointed to security negligence in the failure to prevent groups from invading the pitch at the Besiktas-Galatasaray football match in what he called an incident "orchestrated for provocation".
Bulent Arinc told reporters Monday that between 3,000 and 5,000 people seemed to have entered the stadium covertly for provocative actions, reports Xinhua.
The deputy prime minister said necessary and even radical measures should be taken to prevent similar incidents from taking place.
Hundreds of fans halted the Istanbul derby between Galatasaray and Besiktas after storming the pitch at the Olympic Stadium Sunday.
Galatasaray was leading 2-1 in the third minute of added time when the match was stopped.