Moorhouse said police only became aware of the Sydney St incident after a man with the injuries arrived at Wairoa Hospital, and there were times when the hearing of shots was not reported at all.
Tairawhiti Police continue to focus Operation Kotare on keeping the community safe in Wairoa, but were frustrated to be now investigating two gang-related shootings within days of each other.
"The actions of these perpetrators demonstrate a clear intent to cause harm and a total disregard for life, community safety and the law," Moorhouse said. "Disturbingly, police have found that in the latest two shootings, several people had heard the gunshots and not reported them.
"We are very concerned that a measure of apathy or acceptance may be creeping into the mindsets of our communities and would like to take this opportunity to remind the public that these types of incidents are not OK, and should not be accepted by anyone."
Anyone with any information relating to shots being fired in the town or the two incidents can call police on 111 or through Crime Stoppers on 0800 555 111.