Live updates: Children unwell after incident involving bus and unknown substance in Wellington

RNZ understands school children were gathered near a cordon at the scene as emergency services responded just after 10am.Fire and Emergency said fire crews were called to reports of a bus fire but on arrival encountered an unknown substance.A Hazardous Materials Unit as well as four fire trucks are at the scene.Two ambulances and support vehicles, as well as police are also in attendance.More to come...