Police also confirmed this morning that a number of items were seized after police executed several search warrants across Christchurch on Wednesday.
Police seized several firearms, rounds of ammunition, a large quantity of cash, drugs and drug supply-related items, restricted medicines, and restricted weapons.
Said Detective Senior Sergeant Damon Wells: "We will not tolerate this behaviour, which causes huge distress and has the potential to cause serious harm to members of the public.
The four men with gang links have been charged with several offences and other arrests are anticipated.
"Searches are continuing today at an address in Hoon Hay, and further search warrants are likely," Wells said.
“Police are working incredibly hard to hold these people to account."
If you have information that could help with the investigation, phone the police on 105 or report it anonymously via Crimestoppers - 0800 555 111. If you are in immediate danger call 111.