Six officers suffered minor injuries in the incident on Friday.
Officers were called to West Hampstead after the man was seen with the weapon. They ordered the man to drop the sword and a violent struggle ensued.
Passers-by erupted into spontaneous applause after police seized both the sword and a kitchen knife. A man, 37, has been bailed until April.
Pc John Dunwell, of the Metropolitan Police, said: "Having risk-assessed the situation, I felt it was necessary to confront the man before he hurt himself, or someone else.
"He proved to be very strong and I'm just thankful to my colleagues for coming to my assistance so quickly."
No shots fired, that's pretty impressive. I guess these cops are a different breed than these. Why do you think that is?
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