Officers were called at around 21:30hrs on Wednesday, 19 October, to reports of shots fired in the area of Graham Road, N15. On attending the scene officers found a number of firearm casings.
Police are not currently aware of any people injured.
One vehicle believed involved in the incident was later stopped by police and the three male occupants aged 27, 22 and 31, were arrested on suspicion of possession of a firearm with intent to endanger life. The men remain in custody at a north London police station.
Officers believe a second vehicle, a blue BMW, may be involved in the incident and work is underway to locate this.
If anyone has any information please contact police on 101 or contact Crimestoppers anonymously on 0800 555 111 or at Crimestoppers-uk.org.