A man and woman, named as British citizens Charlie Rowley and Dawn Sturgess are both in critical condition. Police say emergency crews were called to a house in Amesbury, in the region of Wiltshire, in southwest England on Saturday morning, where they found Dawn Sturgess collapsed. They were called back later in the day when Charlie Rowley suffered the same symptoms and also collapsed. The incident took place about 12 kilometres from where the Skripals, a Russian father and daughter, were poisoned with Novichok, a nerve agent, in March.