ST. PAUL, Minn. (AP) — The founder of hearing aid giant Starkey Hearing Technologies says there's an ongoing investigation amid reports of a shakeup in the Minnesota company's senior leadership.

Minnesota Public Radio News reports company president Jerry Ruzicka and three senior executives were fired. MPR cited an internal email it obtained. All four executives' names were absent from the company's website Wednesday afternoon.

Company founder and chief executive William Austin didn't confirm the firings in a statement to The Associated Press. Austin says he can't comment further due to an investigation but says no issues will affect the company.

Starkey is a private company with a foundation that hosts star-studded galas with headlining guests like former presidents Bill Clinton and George W. Bush. The company says it employs more than 3,600 people worldwide.