A man has fallen ill near a Salisbury restaurant where a former Russian spy and his daughter dined before being poisoned.
Emergency services say they are attending an incident involving a man in his 30s.
Last week British counter terrorism police confirmed a critically ill couple found in Amesbury, near Salisbury, were exposed to Novichok.
Dawn Sturgess, 44, one of two citizens poisoned by Novichok in Amesbury, was confirmed dead on Monday.
It's the same nerve agent which poisoned former Russian spy Sergei Skripal, and his daughter Yulia in Salisbury in March.