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Media captionThe latest on the clean-up and the investigation in Salisbury

Traces of the nerve agent employed against former Russian snoop Sergei Skripal and his daughter, Yulia, have been found at the restaurant where they feed on Sunday afternoon, the BBC understands.

The substance was found in one part of Zizzi in Salisbury during a continuing forensic examination.

The pair were found two hours after finishing their meal collapsed on a park bench. Both are critically ill.

No-one who was in the restaurant at the same day 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.

The restaurant is currently surrounded by a large screen while an investigation continues inside.

Zizzi is one of five sites in the small Wiltshire city of Salisbury at the heart of the operation.

Sergei Skripal – narrative of the man at centre of spy story Russian snoop: What we know so far What are nerve agents ? Image caption Sergei Skripal and his daughter Yulia are still critically ill in hospital Media captionHome Secretary Amber Rudd says the police investigation is serious and substantial Image caption Det Sgt Nick Bailey remains in hospital