Detective Inspector Dave de Lange said police were still investigating the disastrous 21st birthday party on Lytton Rd, Gisborne, with a “vast amount” of information for investigators to comb through.
De Lange said further charges were still possible and a decision on this would be made after forensic analysis was done.
About 100 people were involved in the massive fight in Lytton Rd in Elgin, Gisborne, that left two dead and three in critical condition at 11.30pm on Saturday, March 23.
Police confirmed the identities of the two men killed during the 21st birthday celebration as Kane Wiremu Te Paa, 30, of Wainuiomata, and Chrysler Stevens-Mark, 21, of Gisborne.
A final post-mortem had concluded but police would not elaborate on the cause of death for both men, who died from injuries sustained during the altercation.
A 25-year-old man is jointly charged with a 29-year-old who was taken into custody.
Both arrested men were uninvited guests, who arrived at the party shortly before the incident began, police said.
Police have said that while the brawl involved gang members, it was not a conflict between rival gangs.
Officers were brought in from outside Gisborne amid concerns of further disorder.
“Further charges will be considered as the investigation into events on Lytton St, Gisborne, progresses.”
Police asked to hear from anyone who was at the party, or anyone who had photographs or video footage of the party or altercation.