A closed court has seen graphic video of a 2021 terrorist attack in Auckland at New Lynn Countdown. 

A coronal inquest began today into the stabbing of six people at the supermarket.

Officers monitored Sri Lankan Islamic State supporter, Ahamed Samsudeen - then shot him dead.

Newstalk ZB's Jordan Dunn has been at the inquest.

He says police revealed why they didn't originally follow the 35-year old into the store. 

"They didn't think it was a target-rich environment, which essentially means that they knew he was capable of carrying out an attack. They thought if he were to do that, that it would be in a more densely populated area."

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