A section of a Hamilton street has been shut down as the Waikato Armed Offenders Squad search for a wanted person.
An ambulance is also on standby.
At least 12 popping sounds have been heard in the street, which police said are gas canisters being fired.
A play centre is within the cordon.
Waikato Senior Sergeant Robbie Hermann said part of Rimu St will be closed for at least an hour.
