A man and two police officers have been taken to hospital after they were assaulted.
The Metropolitan Police said in a statement that officers and a 61-year-old man were called to an address on Noel Park Road in Wood Green around 7.20pm on Friday night following concerns for the welfare of residents.
While the three were in a communal area, a man approached them before assaulting them, the Met said.
The 61-year-old man suffered stab injuries, with a report on his condition still pending.
One officer suffered slash injuries that were non-life threatening while all three remain in hospital receiving treatment.
Police say a man was arrested on suspicion of assault, while two other people were also arrested as part of the investigation. All three remain in custody.
Police said a crime scene remains in place, and at the this stage the incident was not thought to be terrorism-related.
Anyone with information is asked to call 101 quoting reference Cad 2347/05Aug or Crimestoppers anonymously on 0800 555 111.