Police have located the source of the Novichok nerve agent responsible for poisoning two people in Salisbury last month.

Counter terrorism investigators recovered a small glass bottle from the home of victim, Charlie Rowley, which has tested positive for the deadly chemical.

Further tests on the bottle and its contents are now being carried out, but it is hoped it could also provide crucial evidence to prove who attacked former Russian double agent, Sergei Skripal and his daughter, Yulia, in March.

Dawn Sturgess, 44, from Durrington, Wiltshire died in hospital on Sunday evening after being exposed to the nerve agent the previous weekend.

Her partner, Charlie Rowley, 45, was also taken to hospital critically ill, but has since regained consciousness and has been interviewed by police.

It is thought Mr Rowley was able to help detectives when he emerged from his coma as to the whereabouts of the source of the contamination.