A violent assault by a man wielding a samurai sword was brought to an end by members of the public, footage shows.
Aaron Messenbird, 32, threatened a small group of people in Milton Keynes with the weapon at around 9pm on July 30, in what police described as a violent, unprovoked assault.
One man, who tried to protect the group, suffered injuries to his ribs and hand – including tendon damage requiring specialist treatment.
Another bystander fought Messenbird off using what appeared to be a spirit level.
The attacker fled but was later seen walking elsewhere still carrying the sword.
Messenbird was arrested on August 5 and pleaded guilty to threatening someone with a bladed article, possessing a bladed article in public and assault occasioning actual bodily harm. He was sentenced at Aylesbury Crown Court.
Police constable Jordan Buchanan-Kay said: 'This was a violent and unprovoked incident in which Messenbird threatened members of the public with a potentially lethal weapon before assaulting a man who had stepped in to protect others.
'The victim suffered painful injuries, including damage to a tendon in his hand, as a result of Messenbird's actions.'
32-year-old Aaron Messenbird, was sentenced to 12 months in prison after threatening people with a samurai sword in Milton Keynes on July 30
Messenbird, seen with the sword, was fought off by a passerby using a spirit level
The Police said: 'This was a violent and unprovoked incident in which Messenbird threatened members of the public with a potentially lethal weapon before assaulting a man who had stepped in to protect others'
Police praised the bystanders' bravery but warned the public not to confront someone carrying a weapon, advising people to get to safety and call 999 instead
He continued: 'I would also like to acknowledge the bravery of the members of the public who intervened and helped prevent this incident from becoming far more serious. Their actions undoubtedly contributed to protecting others from harm.
'However, we would always urge people not to put themselves in danger when confronted with somebody carrying a weapon.
'The safest course of action is to move to a place of safety and call 999 immediately, providing as much information as possible to help officers respond quickly.
'I am pleased that Messenbird has been given a custodial sentence and hope this outcome provides reassurance to the victims and the wider community that violent offending involving weapons will not be tolerated.'
Messenbird lived at Wandsworth Place, Bradwell Common, in Milton Keynes.