A nine year old girl needed hospital treatment after a bottle was thrown through the window of a car she was travelling in, showering her with glass.
Abbie Keers was being driven along the A693 in Stanley when she was injured.
Police have described it as a 'mindless act' and are appealing for witnesses.
More top news
Newcastle United are sitting pretty in the Premier League after three straight wins - but boss Benitez is not thinking too far ahead
Darlington for Culture (DfC) wants to hear from arts groups, venues, performers and businesses.
The first signs of autumn are appearing as the equinox marks the start of the season.