The shakeup in management at the company that operates the Buffalo Bills and Sabres ramped up Tuesday with the departure of three executives.

Pegula Sports and Entertainment announced that its chief operating officer, Bruce Popko, and two other top officials had left.

A statement from Kim Pegula, the company's president and CEO, did not give any reason why the trio was exiting PSE and did not name replacements for them. Pegula and her husband, Terry, own Pegula Sports and Entertainment, the Bills and the Sabres.

"While there [have] been many changes in the last year, I am confident that these changes will ensure the long-term success of our organizations," Pegula wrote in an internal company memo obtained by The Buffalo News.

The departures of Popko; Brent Rossi, PSE executive vice president and chief administrative officer for the Sabres; and Erica Muhleman, executive vice president of business development; come a month after two other executives resigned following accusations The News reported that they sexually harassed company employees.

The turnover at PSE dates to last May, when President Russ Brandon resigned amid allegations of personal misconduct.