A string of Twitter accounts have been closed following reports of accounts containing disturbing images of child abuse, the NSPCC said today.
It remains unclear whether any of the images were uploaded by a British user or a user based abroad.
The nationalities of any children involved are also unknown.
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Five people were killed and dozens more were injured after a car and knife attack in the capital on Wednesday afternoon.
Among those expected to attend the ceremony will be former US President Bill Clinton and ex-Northern Ireland first minister Peter Robinson.
Five people have been killed and 40 injured after a car and knife attack in London on Wednesday.