MINNEAPOLIS (AP) -- Prosecutors in the case of a Minneapolis police officer who fatally shot an unarmed woman have been hammering away at what could be a key element of the defense.

That element is whether Mohamed Noor heard a loud slap against his police SUV that stirred fears of an ambush.

The prosecution has tried to raise doubts about whether that slap occurred and attacked officers and investigators for apparent missteps. Testimony indicated that police at the scene turned body cameras on and off at will and possibly disturbed evidence.

Noor is on trial for murder and manslaughter in the 2017 death of 40-year-old Justine Ruszczyk Damond. She was shot as she approached the vehicle after reporting a possible sexual assault in the alley behind her home.