Traffic is building up following an accident just outside of Maidenhead.
The M4 is reportedly closed westbound from the town following an earlier accident.
AA Traffic News is reporting delays of up to 65 minutes with an average speed of 6mph.
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The victim of an assault in Cippenham was flown to hospital by air ambulance this afternoon.
A rapid response vehicle, an ambulance officer, an air ambulance and an ambulance crew were all called to an address in Earls Lane at 2.10pm.