There's an investigation after two children were injured by a falling wall that collapsed when a car crashed into in Plaistow Place on Friday.
Emergency services arrived at the scene at around 6.35pm to find an 11-year-old boy with a serious leg injury and a 15-year-old boy with minor injuries after a wall had fallen on the two.
It's believed two black BMWs had been involved in a chase, before one collided with the wall then fled the scene.
A 51-year-old man from Brighton was arrested on suspicion of possession of a firearm.
Police would like to speak to anybody who saw two black BMWs in a car chase leading up to the incident, or anybody running from the area of Plaistow Place in the aftermath.
Contact police online or call 101, quoting serial 1188 of 04/11.