Republican Arizona gubernatorial candidate Kari Lake’s campaign headquarters received white powder inside an envelope, according to Phoenix police and her campaign, with law enforcement responding Sunday.

First responders were called to a Phoenix office building where Lake’s campaign headquarters was located early Sunday morning due to “suspicious items,” Phoenix police told multiple outlets. Fire authorities said the items were envelopes, and a Lake campaign spokesperson claimed a staffer found “suspicious white powder” inside one when they opened it.

The spokesperson said the staff member who opened the envelope “is currently under medical supervision,” Fox 10 reported. (RELATED: Kari Lake Pushes Back Against Fox News Poll Accusing Her Of Being ‘Too Extreme’)

“There have been no reports of injury and the investigation remains active,” the Phoenix Police Department told the Daily Caller News Foundation.

The FBI and bomb squad units were called to the scene as well according to Fox 10. The campaign office was shut down, and the spokesperson said the envelopes were “sent to professionals at Quantico for examination.”

Lake’s race against Democratic Arizona gubernatorial nominee Katie Hobbs looks very close heading into election day Tuesday, with Lake leading in most recent polls.

Lake’s campaign did not immediately respond to the Daily Caller News Foundation’s request for comment.

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