Young thugs smashed the window of a moving bus in an attack on Friday.
The 395 single decker service to Chester-le-Street was attacked at about 9.45am as it passed a bus stand in Kings Road, Consett.
A youth threw a fist-sized lump of concrete through the glass, but no one was injured.
Anyone with information is asked to contact Consett police on (01207) 504204.
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