From the KCTV site:
Officers Felt They Were in Danger
OLATHE, Kan. - Police said they felt their lives were in danger when they shot a woman yielding a knife.
Those two officers were on paid administrative leave while an investigation was done into the incident. Officials said that is standard procedure when a firearm is discharged.
Shooting a knife-yielding woman instead of a knife-wielding woman would be grounds for even more serious inquiry.