Allied Security is investigating after one of its security guards was filmed on CCTV beating up a homeless man outside a Wellington supermarket.
The video, uploaded to YouTube, shows the security guard talking to the homeless man, who is lying in a sleeping bag outside what's believed to be the Lambton Quay Countdown.
The homeless man jumps to his feet and throws a punch at the security guard, who then pushes the man into the wall. The pair fall to the ground and the guard can be seen pinning the man on the ground and punching him repeatedly. They then tussle on the ground as numerous pedestrians walk by.
The incident is believed to have happened on January 10.
A security industry insider who viewed the footage said he was "shocked" and called the guard's behaviour "unacceptable".