MISSISSAUGA, Ont. - Ontario's police watchdog says there are "no reasonable grounds" to charge three Peel Region police officers in the fatal shooting of a Mississauga man on March 20.

Just after 4 p.m. that day, a resident of a townhouse complex called police to report that a neighbour had made a death threat and threw a knife at her.

When officers tried to arrest the female neighbour, her 22-year-old son appeared with a large kitchen knife.

The Special Investigations Unit says the man resisted arrest, a struggle ensued, and two officers were wounded with the knife and the man's mother struck an officer on the back of the head with a metal pot.

The man slipped free and ran away, but returned with the knife and screamed at the officers to release his mother.

When he refused orders to stop, officers fired 19 shots and struck the man 11 times.