"Three people have been taken into custody and are assisting police with their inquiries," police said. "A firearm and ammunition has also been recovered."
No charges have yet been laid.
Armed police are now standing guard on Whimbrel and Benthos Roads.
Auckland Transport has also tweeted that the 355 bus services will be diverted via Flat Bush School, Chapel and Thomas Roads, because of a closure on Hikuawa Rd in Ormiston.
"The following stops will be missed: 6914, 6901, 6765, 6924, 6479, 6926," AT said.
"Expect delays & cancellations."
Update at 14:14: Road has reopened, detours no longer required. ------------ The 355 bus services will be diverting via Flat Bush School Rd, Chapel Rd & Thomas Rd, due to road closure on Hikuawa Rd, Ormiston. pic.twitter.com/cCBkOCrlQz
— Auckland Transport Travel Alerts (@AT_TravelAlerts) August 10, 2021