The officers had been called to a home on Warringah Road in Narraweena about 5.20pm when they were allegedly approached by a man holding a knife, police said in a statement.
The man allegedly hit an officer in the head with a fire extinguisher. The same officer was also allegedly stabbed in the hand.
The wounded officer’s colleague then drew his gun and shot the alleged stabber in the leg.
The man has been taken under police guard to hospital in a stable condition.
The officer was also taken to hospital in a stable condition.
Neither man sustained life-threatening injuries.
A crticial incident has been declared following the incident, with investigations into the circumstances ongoing.
More to come.