(CNN) -- A vehicle in the Gulf Shores Mardi Gras parade in Alabama plowed into a marching band from behind, sending several people to the hospital Tuesday.

At least 12 people have been injured, including three who were critically hurt, Gulf Shores city spokesman Grant Brown said.

At least four people were taken to South Baldwin Regional Medical Center, the hospital said.

CNN affiliate WKRG said students were among the injured.

Brown said the parade has been canceled in the coastal Alabama city.

Developing story - more to come