Police opened fire on a gang attacking a victim in Yau Ma Tei and arrested three suspects.
A witness caught the dawn attack on video.
It shows three men attacking another with knives at the intersection of Parkes Street and Ning Po Street, according to the Hong Kong Economic Journal.
Police described all four as South Asian.
A police patrol arrived and gave repeated warnings before firing four shots, which hit two attackers, aged 25 and 23.
The three attackers were arrested — one while trying to flee.
Their 33-year-old victim suffered hack wounds to the head, back and legs and was brought to Kwong Wah Hospital where his condition is not known.
The wounded suspects were sent to Queen Elizabeth Hospital and were later released to the police.
All four are from Nepal, according to Apple Daily.
Commander Ma Wai-hing, head of the Yau Ma Tei police station, said the officers decided to use their guns to save the victim after the attackers ignored their warnings and continued to hack him.
The shots were fired from a distance of about 10 meters, he said.
The Kowloon West Regional Headquarters crime unit is investigating the case suspected to be over a business rivalry.
Chris Ip, chairman of Yau Tsim Mong District Council, said it has requested the police to step up patrols and law enforcement in the area.
He said the council will meet representatives of minority groups to promote public security.
The two officers who fired shots are nine-year and 17-year veterans of the police force, according to Ming Pao Daily.
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