An explosive device has detonated at a restaurant in an Exeter shopping mall.
One person, believed to be responsible for detonating the device, was hurt in the blast at 1250 BST in the Giraffe restaurant in the Princesshay centre.
A police spokesman said a 22-year-old man was in custody with "slight injuries" including lacerations to his eye and some facial burning.
Chief Constable Stephen Otter said one device exploded in the restaurant and another was found nearby. The second device did not explode.
MailOnline says "nail bombs."
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Photo credit: Apex, courtesy MailOnline.
UPDATE: Attack was in Exeter, not London, as I previously noted, post corrected.