Five men have been arrested in relation to a public shooting in Guildford earlier this year.
More arrests are expected to follow.
A police spokesman said the arrests follow an incident on July 25 about 4.45pm, when police were called to Garnet Street, Guildford, in response to reports of several shots being fired.
Specialist forensic police located several spent bullet cartridges and officers from the Rosehill local area command formed Strike Force Tomlin to investigate.
At 6am today (Thursday), police from Rosehill local area command and specialist officers from the Tactical Operations Unit searched properties in Guildford and Merrylands.
Three men, aged 28, 21 and 19, were arrested at the Guildford property.
A short time later, a 34-year-old man was arrested in South Granville.
A fifth man, 32, from Guildford, was arrested at Parramatta police station at 10.30am.
A police spokesman said the men are helping police with their inquiries and detectives are expected to make more arrests.
Police will allege the shooting incident involved two groups who had been arguing on the street shortly before the bullets were fired.