A school bus crashed into the back of a fire truck in Detroit around 8:30 a.m. Tuesday.
The accident happened on Six Mile Road at Greenfield Road.
Investigators said the fire truck did not have its emergency sirens on.
It is unknown whether it was responding to a call.
Five children, none of them injured, were on the bus.
Two firefighters were transported to a local hospital.
There is no word on the extent of their injuries.
A second bus arrived to pick up the children and take them to their destination.