Cordons were in place near Arapuni Rd and the public was asked to avoid the area.
“There is not believed to be any risk to the wider public at this time,” the spokesperson said.
Te Awamutu College informed parents that because of the road closure, bus 13 would be detoured via Puahue Rd and Monckton Rd.
“Any students who get off the bus before Parawera Marae on Arapuni Rd need to be picked up from school,” the school said on social media.
In an update, Waikato West Area Commander Inspector Andrew Mortimore said a man had been taken into custody and charges were pending.
“Police are not seeking anyone else in relation to this incident,” Mortimore said.
“Police remain at Mellsop Rd for the time being, but remaining cordons on that road will be lifted this evening.”