Police in Porirua believe alcohol was a factor in a crash involving a car and four gang members riding motorcycles just north of Wellington.
The Highway 61 gang members were on State Highway One from Wellington to Paraparumu, when the crash happened.
Police say two motorcyclists tried to pass two cars on a bend. One passed safely, but the other clipped a cars and three motorcyclists travelling behind were caught in the pile-up.
Constable Grant Nalder says he could tell some of the motorcyclists had been drinking when he talked to them at the crash site. He says charges could be laid.