Elliot St residents said they heard a big noise and screaming passengers.
A fire chief at the scene said the passengers were mostly students, and he recognised Rosehill Intermediate and Rosehill College uniforms.
“We helped ambulance … there were a lot of walking wounded”, Papakura Fire Brigade senior station officer Brendon Lawson said.
Eight people were injured when a school bus crashed into a tree in South Auckland.
Rosehill College sent an email to parents that said senior leadership went to the site as soon as possible to work alongside emergency services to support students on-site.
“We will continue to support whānau during this time.
Stacey van der Putten, Auckland Transport (AT) director of public transport and active modes, said AT was working closely with emergency services and Ritchies to ensure a thorough investigation.
“This will have been a distressing incident for everybody onboard the bus and AT will be reaching out to passengers today to offer our support.”