The bizarre cancer clusters affecting longtime nurses have unfolded at the fifth-floor maternal care ward inside the Newton-Wellesley Hospital in Newton, a Boston suburb, with at least three nurses requiring surgery, according to a whistleblower.

"It's getting to the point where the number just increases, and you start saying, 'Am I crazy thinking this? This can't just be a coincidence,'" the whistleblower, battling a recent brain tumor diagnosis, told CBS Boston.

The whistleblower claimed "as many as ten nurses who work on the fifth floor have been diagnosed with different brain tumors over the last few years, some cancerous and some not."

In a statement to CBS Boston, Mass General Brigham/Newton-Wellesley Hospital acknowledged they'd launched an investigation after becoming aware of the issue in December and have "interviewed eight nurses, five of whom it said have had benign brain tumors."

The hospital also noted the tumors were benign and not cancerous, and that "no environmental risks" were identified, despite the multitude of hospital factors that could contribute to such diagnoses, such as chemicals, hormones, EMFs and radiation — not to mention mandatory vaccines.

Here's the statement to CBS Boston/WBZ-TV from Jonathan Sonis, Associate Chief Medical Officer and Vice President of Medical Affairs, and Sandy Muse, Chief Nursing Officer and Senior Vice President of Patient Care Services:

"After we became aware of reported brain tumors in individuals who currently or previously had worked in the same area of the hospital, we conducted an extensive investigation in collaboration with the Department of Occupational Health and Safety, Newton-Wellesley Safety Officer, radiation and pharmaceutical safety offices, and external environmental consultants.

Every staff member who came forward was given the opportunity to be interviewed by the Occupational Health and Safety team to evaluate each diagnosis in the context of their individual medical history and risk factors. To evaluate for any possible environmental exposures in that area of the hospital, comprehensive environmental assessments following CDC guidelines began in December.