Police say witnesses from outside the house reported seeing a man, described as South Asian, wearing a mask and running from the scene.
Police say when they arrested the man they found an AK47 assault rifle, a handgun and a large amount of cocaine and heroin inside the vehicle.
The filming of a movie based on the true story of a Sikh boxer, who was barred from the sport as he refused to shave his beard, is underway at a US university.
People on the Paul First Nation found the girl's partially clad body in the snow a few days before last Christmas.
Glynnis Kirchmeier, who is planning to launch a human-rights case against UBC, published an open letter to the university's interim president on Tuesday.
Witnesses who found Berg said her legs, arms and mouth had been taped and her face was bloody.