A woman is in a critical condition in Royal Darwin Hospital after allegedly being attacked in a Palmerston home by a man she knew, NT Police said.

Police director of communications Mark Wilton said neighbours called police about 8pm Wednesday after a “disturbance” in the Johnston home.

“Neighbours, upon hearing the disturbance contacted triple zero and rendered assistance and provided first aid prior to St John Ambulance and police attending,” Mr Wilton said.

“The victim, a 22-year-old female, was conveyed by St John Ambulance to Royal Darwin Hospital in a critical condition.”

Mr Wilton said a 22-year-old man was arrested at the scene and taken to Palmerston Watch House where he remains in custody as an investigation by the Domestic Violence Investigation Unit is undertaken..

Police have thanked the neighbours for helping the woman, and are asking anyone who saw the assault to call them on 131 444 (quote reference P25138375).

If you, or someone you know, are experiencing difficulties due to domestic violence, support services are available, including, but not limited to, 1800RESPECT (1800737732) or Lifeline 131 114.