It all started when German-Turkish blogger ThatsBekir, who boasts more than 260,000 subscribers on YouTube, called on his followers to assemble at Alexanderplatz.

There they would face the supporters of Bahar Al Amood, who is of Arab origin and runs a channel with 14,000 subscribers. It’s unclear what exactly prompted the confrontation on Thursday, but the two ‘influencers’ appeared to have been exchanging insults and feuding online for a while.

A total of nine people were detained. Two knives were confiscated by the police, as one man was reported shouting “I will stab you” while he was apprehended. Around a dozen investigations have been launched, for inflicting grave bodily harm and public disturbance, among other things.