THE Couple poisoned by a deadly nerve agent near Salisbury must have received “a high dose” of Novichok when they handled a vessel containing the substance, a leading police officer has said.

Dawn Sturgess, 44, died and her partner Charlie Rowley, 45, is still in a critical condition after the couple fell ill in Amesbury, Wiltshire, last Saturday.

The murder investigation is the second major probe involving the nerve agent this year, following the case of Sergei and Yulia Skripal who were left critically ill in March. Both have recovered.

Assistant Commissioner Neil Basu said: “The investigation is being led by detectives from the UK’s counter-terrorism policing network, and they are unable to say at this moment whether or not the nerve agent found in this incident is linked to the attack on Sergei and Yulia Skripal.”