Part of Maidenhead High Street is closed after the engine of a bus hit a speed bump at about 3.20pm today (Friday).
Police and firefighters have cordoned off the road near Greggs and the bus will be towed away.
The road will remain closed until a highways team has come and cleared oil off the road.
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The Met Office has issued a yellow alert for Windsor and Maidenhead, Slough and Wokingham, warning that rain moving eastwards across the south of the country may turn to snow in some places.