In the aftermath of the London terror attack which has left four people dead and China Archivesmany more injured, people have been sharing messages of hope and defiance on Twitter.

J.K. Rowling is no exception. On Wednesday evening, the author responded to a tweet from radio presenter Julia Hartley-Brewer with a message of resistance.

Here's Hartley-Brewer's original tweet.

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And here's Rowling's response, which came later that night.

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At the time of writing, her message had been retweeted over 10,000 times.