There was an extraordinary end to a dramatic standoff in Ottawa's Centretown neighbourhood Friday.

A man jumped from a second storey window after an eight-hour standoff with police at a home on Flora Street at Percy.

Neighbours say they heard an argument and that a man, allegedly with a knife, had barricaded himself inside.

Police negotiators, the tactical team and paramedics were on scene for the entire day as the situation unfolded.

The man is said to have serious injuries as a result of the fall and has been taken to hospital.