Dozens of people were treated Wednesday by rescue teams after a chemical leak inside a Midwood spa.

Officials say it all started in the basement inside World Spa. They say workers accidentally mixed acid and chlorine together, causing workers to start filling sick.

Police say more than 20 people were treated on the scene and five others were taken to the hospital in stable condition.

World Spa, which opened in December, is located at 1571 McDonald Ave. The 50,000 square-foot center offers spa treatments, facials, sauna room and fine dining experiences.

World Spa issued a statement saying, "We were deeply concerned by the incident that occurred at our spa in Brooklyn on Wednesday night. Our first priority is the safety and well-being of our customers and team. Because of the strict health and safety protocols we have in place, we acted quickly, contacting all relevant authorities to assess and address the situation. Our team fully cooperated with emergency services to ensure all affected staff received necessary medical attention. The incident occurred after the spa was closed, and no customers were affected. Upon inspection, all relevant agencies determined that the spa was safe to reopen. However, out of an abundance of caution, we have decided to stay closed for the day to ensure that our employee's needs are being met."