No suspects identified yet in Salisbury nerve agent attack, UK national security adviser says

No suspects have yet been identified in the Salisbury nerve agent poisoning investigation, the UK's national security adviser has told MPs.Sir Mark Sedwill, who advises the Government and works closely with the police and security services, also confirmed that security is being reviewed around other former spies who may be at risk.It is now almost two months since Sergei Skripal and his daughter Yulia were found slumped on a park bench in central Salisbury after being exposed to the military gra