A major operation involving armed police has been executed at the central Auckland Hell’s Angels headquarters in Mt Eden.  The operation began around mid-morning on Brentwood Ave in the central Auckland suburb.  Police at the scene told the Herald there is still an ongoing investigation.  A heavy police presence could be seen around the property, with several marked and unmarked patrol cars in the area and the Police Eagle helicopter flying overhead.  A witness said three people were pulled out of the property, with one put in a police car.  The helicopter was there for about an hour, they added, but has since left.  Police dogs could be seen searching the house and a neighbouring property. Photo / Anna Heath  Police dogs could be seen coming in and out of the house and a neighbouring property.  One woman who was taken out of the house was seen being spoken to by police away from the property, while another male removed could be seen speaking to officers outside.  The Police Eagle helicopter could be seen flying above. Photo / Anna Heath  They have since been allowed to return inside.  The police presence stretched along most of Brentwood Ave and Horopito St.  An officer speaks to a woman after police swarmed a property linked to Hell's Angels on Brentwood Ave, Mt Eden this morning. Photo / Anna Heath  Police have been approached for comment.