3,600 nurses at Mount Sinai Hospital in Manhattan and 3,500 at Montefiore Medical Center in the Bronx were set to go on strike Monday in a dispute over pay and staffing levels after a weekend of negotiations that has yet to produce a deal for a new contract.

The New York State Nurses Association, which represents the workers, said it was being forced into the drastic step because of chronic understaffing that leaves nurses caring for too many patients.

The New York State Nurses Association (NYSNA) plans to walk out at 6 a.m. ET if a deal isn’t reached.

The tentative deals reached at other hospitals provide nurses with a combined 19.1% in pay increases over the three-year life of the agreements and includes promises by management to increase staffing to address the union’s major complaint of nurses being overworked and facing burnout.

NYSNA President Nancy Hagans said, Montefiore has 760 nursing vacancies, adding that “too often one nurse in the emergency department is responsible for 20 patients instead of the standard of three patients.”

The hospitals have been preparing for a strike since the nurses union gave notice of its plans 10 days ago. The affected hospitals plan on paying temporary “traveling” nurses to fill in where possible and some had already begun transferring patients.

Strikes have become more common nationwide, as tight labor markets and unhappiness with work conditions have prompted unionized employees to flex their muscles more often at the bargaining table.

There were 385 strikes in 2022, up 42% from 270 in 2021, according to the Cornell University School of Industrial and Labor Relations. The US Labor Department, which tracks only major strikes by 1,000 or more workers, recorded 20 strikes in the first 11 months of 2022, up 33% from the same period in 2021.

Numerous nursing strikes were among the recorded work stoppages, with many unions citing instances of burnout and health problems among members.