More details continue to emerge in the ugly incident between Chicago Bulls teammates Nikola Mirotic and Bobby Portis.

Veteran basketball writer Peter Vecsey reported on Wednesday that Mirotic was the aggressor in the altercation with Portis at Bulls practice this week that left him with facial fractures and a concussion after Portis punched him.

Per Vecsey:

Mirotic initiated the skirmish. “He was the aggressor, not Portis,” I am informed. “Mirotic shoved Portis twice, maybe three times. When Portis retaliated with a hard shove, Mirotic charged him. Portis put him down.”