PHILADELPHIA—Police say several students taken to hospitals after reporting nausea and dizziness due to fumes at a northeast Philadelphia elementary school have been released.

Philadelphia School District officials say exhaust fumes from a backup generator sickened some students at Joseph H. Brown Elementary School in the city's Holmesburg section beginning at about 9:30 a.m. Tuesday.

Spokesman Fernando Gallard says 53 students were taken to five area hospitals for observation, but all were later released. Three adults were also taken to hospitals, but their conditions were not immediately available.

The school, which has about 530 students, was evacuated, and other students were taken to Emmanual Resurrection Episcopal Church.

Gallard said the exhaust system is being repaired and tests must still be done, but officials hope to have the school open Wednesday.