A person was taken to Whanganui Hospital in a critical condition following an incident in Whanganui East on Thursday evening.
A police spokesperson said police were called to the Duncan St/Moana St area around 5pm after reports of a disorder.
Police said one person had been badly injured and was taken to Whanganui Hospital in a critical condition.
No one had been arrested at this stage and police had not received an update on the condition of the person taken to the hospital.