The NSW police commissioner says there will be more arrests after four alleged members of outlaw bikie gangs were charged over a recent spate of shootings. NSW Police Commissioner Andrew Scipione issued the warning after four members and associates of the Hells Angels and Nomads outlaw motorcycle gangs were charged on Thursday with various firearms and drugs offences. Strike Force Kinnarra has been investigating five drive-by shootings at homes and businesses on April 17 followed by a string of other shootings over the following days. Police believe some of the shootings are linked to conflict between the warring bikie gangs. 'We will continue to go after offenders that see that they have some right or belief that they can go and use a firearm in the streets of New South Wales and get away with it,' Mr Scipione told reporters on Thursday in Sydney. 'Well, the bad news is you won't get away with it. (Four) outlaw motorcycle gang members charged today. They aren't the first and they won't be the last.' Police charged a 21-year-old Hells Angels associate with shooting up a house. A 30-year-old former high-ranking Nomads member was charged with two counts of firing on houses that endangered the safety of the people inside. Police charged two other former Nomads members with drugs supply and possession offences. Inquiries to locate and arrest a fifth man are continuing. Since April, Kinnarra investigators have made 40 arrests, laid 142 charges and seized 13 firearms, 2500 rounds of ammunition and various amounts of drugs.