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CHATTANOOGA (CNN) – Multiple people were killed in a school bus crash in Chattanooga, Tennessee, on Monday, Assistant Police Chief Tracy Arnold said.

The bus was carrying 35 children ranging in age from kindergarten to fifth grade. It wasn’t immediately clear if children were among the dead. Arnold could not provide a specific number of people killed, saying only “multiple fatalities” occurred.

The bus appears to have slammed into a tree, which split it apart.

At least 23 people were transported to local hospitals after the single-vehicle crash.

The bus driver is cooperative and talking to investigators, police said.

A tweet from the Chattanooga Fire Department showed the bus on its side and up against a tree as emergency officials extricated the last patient through the back door.

  • Medics rushed nearly two dozen people to hospitals in Chattanooga on Monday after a school bus crashed in the Tennessee city, officials said. The bus appears to have slammed into a tree and looks like it was split apart.
  • Medics rushed nearly two dozen people to hospitals in Chattanooga on Monday after a school bus crashed in the Tennessee city, officials said. The bus appears to have slammed into a tree and looks like it was split apart.
  • Medics rushed nearly two dozen people to hospitals in Chattanooga on Monday after a school bus crashed in the Tennessee city, officials said. The bus appears to have slammed into a tree and looks like it was split apart.
  • Medics rushed nearly two dozen people to hospitals in Chattanooga on Monday after a school bus crashed in the Tennessee city, officials said. The bus appears to have slammed into a tree and looks like it was split apart.