THEY WILL BE CLOSED TOMORROW AND SATURDAY. THE MAYOR HOPES TO REOPEN THEM BY NEXT WEEK. >>> AN UNEXPECTED WARNING FROM APPLE ABOUT THE iPHONE 12. IF YOU HAVE ONE, IT COULD AFFECT YOUR HEALTH. >> Reporter: APPLE IS TELLING CUSTOMERS THE 12th COULD INTERFERE WITH MEDICAL DEVICES. WITH MILLIONS OF PHONES SOLD THAT COULD IMPACT A LOT OF PEOPLE. APPLE ISSUED THE WARNING BUT, DID YOU HEAR IT? THE MAGNETS AND ALL iPHONE 12 MODELS MAY INTERFERE WITH PACEMAKERS AND IMPLANTED DEFIBRILLATORS. CARDIOLOGIST TESTED THE POWER THEMSELVES THINKING IT WOULD NOT WORK. >> WE WERE SURPRISED. >> Reporter: THEY RECRUITED A DEFIBRILLATOR PATIENT WHO AGREED TO HELP. >> WE BROUGHT THE iPHONE CLOSE TO THE CHEST AND KEPT IT ON THE THE BB LATER AND DISCOVERED THAT THE iPHONE HAS DEACTIVATED THE DEFIBRILLATOR. >> Reporter: WHEN IT WAS REMOVED, THE DEFIBRILLATOR STARTED TO WORK AGAIN. WITH PACEMAKERS, THEY ARE CONCERNED THE PHONE COULD AFFECT THE RHYTHM. APPLE SAYS THE FOUR DIFFERENT 12 MODELS HAVE MORE MAGNETS MAKING THEM MORE POWERFUL. WHAT SHOULD YOU DO? APPLE SAYS KEEP THE PHONE AT LEAST 6 INCHES FROM MEDICAL DEVICES. DO NOT HAVE IT IN A SHIRT POCKET OR PANTS POCKET. THEY ALSO FLAGGED THE WIRELESS CHARGERS SAYING KEEP THEM 12 INCHES FROM MEDICAL DEVICES. THE FDA IS LOOKING INTO THE FINDINGS. APPLE ISSUED A WARNING AFTER THE DOCTORS PUBLISHED THEIR FINDINGS.