A 22-year-old has been arrested in relation to a firearms incident last month at Auckland's Sofitel Hotel.

He is the second person charged in relation to the alleged incident, and the eighth person in connection to the police investigation.

Police seized two firearms. Photo / Supplied

Detective Inspector John Sutton said three search warrants were carried out at a West Auckland addresses this morning.

"Police recovered two firearms – a shotgun and a military-style semi-automatic firearm – and hundreds of rounds of ammunition," Sutton said.

"A large amount of cannabis and cash amounting to tens of thousands of dollars were also seized."

The man arrested today is expected to appear in the Waitakere District Court this afternoon.

He is also facing a number of other charges relating to drug dealing, unlawfully possessing firearms and participating in an organised crime group.

Three search warrants were conducted at West Auckland addresses. Photo / Supplied

Police are continuing to make inquiries into other individuals allegedly connected to the incident, and indicated further arrests are likely.