MINNEAPOLIS (AP) -- The partner of a Minneapolis police officer who shot and killed an unarmed woman who had called 911 to report a possible rape near her home is describing the moments before the shooting.

Officer Matthew Harrity is a critical witness in the trial of Mohamed Noor. Noor killed Justine Ruszczyk Damond with a single shot as she approached the officers' squad car in July 2017.

Harrity testified Thursday that he and Noor were rolling down the alley behind Damond's house searching for anything related to the 911 call of a woman in trouble. Harrity testified he had pulled the hood off his gun's holster in case he needed to draw it.

Asked why, Harrity said he considers every call a threat until it's not.

His testimony is continuing.