"We believe this to have been an isolated incident and do not believe there is any further risk to the public," said Canterbury District Commander, Superintendent John Price.
"We are absolutely committed to finding those responsible for this offending and holding them to account.
"Reducing incidents of gun violence is paramount for Police and the community.
"We will not tolerate it - gun violence has no place here and threatens the fundamental right of the community to be safe and feel safe."