Residents of a Hamilton home have been decontaminated after white powder "sprayed out" of an envelope delivered there.

Fire crews were sent to a house in Inverness Ave, Hamilton shortly before 1pm.

Fire Service spokesman Scott Osmond said the service was called after a suspicious envelope was found.

"Someone opened an envelope in a house and some white powder sprayed out of it," he said.

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Fire crews, including a Hazardous Materials unit, decontaminated some people at the scene.

He said the Defence Force was due to carry out tests on the powder.

No one was taken to hospital.

The incident was not linked to another incident currently underway in Glenview, Hamilton.

NOTE: An earlier version of this story incorrectly attributed police comment about the Glenview incident to this incident.