Residents reported hearing tear gas canisters go off and police speaking through a loud hailer.
Police released a statement about 2.30pm saying that the incident had concluded.
"All police cordons have been lifted and there is no concerns for the safety of any member of the public."
They did not specify if any arrests had been made.
A Strathmore St resident, who asked not to be identified, said he saw police carrying riot shields and wearing gas masks approaching a house on the street.
"They're trying to hunt a fulla out of the house," he said.
A Twitter user posted a photo of one of the road blocks. "Multiple police blocked off roads and have rifles in #Morrinsville," the tweet said.