Students from an Atlanta elementary school where potentially deadly carbon monoxide seeped into the air will continue attending classes at a middle school about three miles away.
Fire officials say Finch Elementary School will not reopen until a deficient boiler system is inspected and certified.
More than 40 students and seven adults were treated at hospitals Monday after complaining of symptoms from the colorless, odorless gas.
Atlanta Public Schools said in a statement Tuesday morning that students can still walk to Finch, and buses will pick them up there and take them to Kennedy Middle School. Parents can drop off their children at Finch, where buses will pick them up, or at Kennedy.
Finch Elementary has no carbon monoxide detectors, and Georgia law does not require them in schools.
Meanwhile, Georgia's state fire commissioner says investigators are unable to determine the cause of the leak because school maintenance workers began dismantling the system before it could be examined.
Georgia Insurance and Safety Fire Commissioner Ralph Hudgens said maintenance workers at Finch Elementary School had started taking it apart by the time investigators from his office arrived.
Hudgens said that "destroyed any ability that we would have to determine what the cause was."
Atlanta Public Schools spokesman Steve Alford tells The Associated Press that maintenance workers were trying to resolve an emergency issue. He said their primary concern was to identify the issue and make sure students were safe.