Video has emerged of an alleged unprovoked attack by police on a student in Christchurch.
Matt Burns claims police overreacted following a noise complaint about a birthday party early Sunday morning.
He says an officer charged at him, slamming him to the ground while he was on his phone.
Police say they responded to calls for assistance from Armourguard security staff after bottles were thrown at them.
They say the short clip doesn't necessarily provide a full picture of what occurred.