Police have searched CCTV security camera footage to follow the accused mosque gunman on his route from Dunedin to Christchurch on March 15.
It includes security footage from an Oamaru service station where he stopped for fuel.
But police are refusing to say whether the vehicle was carrying explosives which were found when he was apprehended after the deadly attacks on the Al Noor mosque in Deans Ave and the Linwood Islamic Centre.
The accused's vehicle was rammed to a stop in Brougham St, Sydenham.
Two armed police removed him from the vehicle, and he was handcuffed. Explosives were in the vehicle, police said.