Sergei Skripal, once a colonel in Russia's GRU military intelligence service, and his 33-year-old daughter, Yulia, were found slumped unconscious on a bench outside a shopping centre in the southern English city of Salisbury on Sunday afternoon.
Violence against Muslims is rarely labelled as "terrorism" but reputable scholarship on radicalisation and terrorism doesn't make a distinction between anti-Muslim violence and the violence perpetrated by groups like Daesh or Al Qaeda.
The latest arrest was of a 23-year-old man in Sussex. Britain has lowered its security level from "critical" to "severe," meaning the country remains on high alert a week after the suicide attack killed 22 at a concert in the northern English city.
Several arrests have been made after the Daesh-claimed bombing at US pop star Ariana Grande's concert killed 22 and injured over 60 on Monday.
Images of the Duchess of Cambridge and her children have been stolen from the phone of her sister Pippa Middleton.
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