A SPATE of knee-cap shootings have been linked to an ongoing turf war between bikie gangs.
There have been four shootings in the Sydney area of Guildford in the past month, including knee-cappings and shots fired into a house in a quiet suburban street.
Three of the shootings happened on Monday night in Merrylands, Guildford and Auburn.
A house was targeted in Merrylands, about 1.30am, but police said they believed that incident was a case of "mistaken identity".
About 7.30pm a man, 33, was ambushed near an industrial warehouse in Edgar Buggy St as he sat in a white van. He admitted himself to Westmead Hospital not long after with a gunshot wound in his leg.
Two hours later, another man arrived at Auburn Hospital emergency department, where he was also treated for multiple gunshot wounds in his legs.
Sources said some of the shootings were related to outlaw motorcycle gang activity.
However, bikie gang shootings were hard to deal with because "they don't usually talk to us".
Hells Angels members have been feuding with both the Comanchero and Nomads since beginning an aggressive expansion in several western Sydney suburbs.
The Hells Angels clubhouse is in Guildford.
A senior police source said the bikie activity usually came in waves.
"I don't think there has been a spike in bikie gang activity, they have always been there," the source said.