Traces of the nerve agent used against former Russian spy Sergei Skripal and his daughter, Yulia, have been found at the restaurant where they ate on Sunday afternoon.
The substance was found in one part of Zizzi in Salisbury during a continuing examination. The father and daughter were found two hours after finishing their meal collapsed on a park bench. Both are in critical condition.
No-one who was in the restaurant at the same time is thought to be in danger. There is also no suggestion that anyone dining at the time had anything to do with the nerve agent. Anyone who was at the restaurant last week is being asked to wash possessions as a precaution.
Prof Dame Sally Davies, the chief medical officer for England, said the risk of harm was “low”. Dame Sally said after “rigorous scientific analysis” there was some concern that prolonged exposure over weeks and months could cause health problems but it was “not a subject for panic”.