Philadelphia police officers shot two dogs, a pit bull and a bull mastiff, that were attacking a man on a city street overnight, killing at least one of the animals.

The dog mauling occurred at around 4.40am on Monday at the intersection of 6th and Tioga streets in the Hunting Park neighborhood, and was caught on surveillance video.

The dogs were biting the 57-year-old man on his arms and legs when three police officers responded to the scene and opened fire on the animals.

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CCTV video shows the moment two large dogs attacked a 57-year-old man in Philadelphia early Monday morning

The victim was pulled to the ground and shaken by a 100-pound bull mastiff and a pit bull. When a passerby tried to intervene, one of the dogs chased him off

The man's injuries were so severe that bone was visible through his deep puncture wounds

Within six minutes of the attack, three officers arrived and opened fire on the dogs

The pit bull was startled by the gunfire and ran off, but the bull mastiff was killed

The incident took place at the intersection of 6th and Tioga streets in the Hunting Park neighborhood

One of the dogs, a 100-pound bull mastiff, died at the scene while a pit bull was struck by a bullet but was able to run away, reported 6ABC. The latter dog so far has not been located.

The victim was pulled to the ground by the two canines and shaken, according to Police Chief Inspector Scott Smalls.

The man's injuries were so severe that responding officers could see bone through his deep puncture wounds and had to apply two tourniquets to stop the bleeding, reported NBC Philadelphia.

The 57-year-old man, who has not been named, was rushed to Temple University Hospital in critical condition.

It was not immediately known who owned the dogs responsible for the attack or where the animals came from.

Police shot and killed the bull mastiff, and wounded the pit bull, which managed to run away (stock images)

The mauling and the subsequent police-involved shooting were captured on surveillance video, and were also witnessed by someone in the neighborhood.

The video obtained by Fox29 shows a passerby trying to intervene and strike the dogs with a cane, only to be chased by one of the canines, which then resumes biting the victim.

When officers opened fire on the dogs, the pit bull was startled and fled, but the bull mastiff initially did not react to the gunfire and continued gnawing on the man.

The incident comes a week after three pit bulls killed nine-year-old Emma Hernandez in Detroit. The owner of those dogs has since been charged with second-degree murder and manslaughter.