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A western Sydney resident has revealed how he found his neighbour with "a hole in his chest" after hearing gunshots outside his home.
Police today arrested a 27-year-old man after raiding a home on Lansdowne Street in Merrylands, just metres from where the shooting took place.
Three other alleged accomplices were still on the run.
Details of the aftermath of the multiple shooting emerged with a witness, who asked not to be named, telling AAP that he found his 62-year-old neighbour, understood to be Graeme Hunt, lying outside his Merrylands home on Wednesday night just before 11pm.
"I lifted up his shirt and I saw a hole in his chest," he told AAP.
"His shirt was ripped and there was a patch of blood."
The man said Mr Hunt, who has lived in the street for 30 years, thought he had been tasered.
Police say Mr Hunt was an innocent bystander who came out of his home on Lansdowne Street after hearing a commotion outside and was shot once to the chest.
He was in a critical condition in Westmead Hospital.
Another man was shot multiple times in the chest, arm and stomach.
The 19-year-old was also taken to Westmead Hospital, where he was in a stable condition.
Police say the teenager and his two mates, 17 and 18, were driving to a home in Lansdowne Street to buy a mobile phone that was advertised on social media.
As the trio drove along the street, two males flagged them down.
According to police, one man got into the back seat of the vehicle, allegedly armed with a handgun.
He allegedly demanded money and personal belongings while two more men approached the car.
An altercation broke out and the 19-year-old was shot.
The three teenagers managed to drive to the Caltex service station on Woodville Road, a kilometre away, where they called police.
The 27-year-old man, who a neighbour claimed lived at home with his parents, was expected to be charged later today.
Police Detective Superintendent Scott Whyte said every effort would be made to catch the three other alleged attackers.
"I can tell you now we will be throwing every resource we possibly can to get these three outstanding - for want of a better term - grubs," he said.