Reuters has quoted British counter-terrorism police chief Neil Basu as saying that police are currently trying to track a contaminated item which might have caused the death of 44-year-old Dawn Sturgess from Amesbury, who is thought to have come into contact with it.
"This latest horrendous turn of events has only served to strengthen the resolve of our investigation team as we work to identify those responsible for this outrageous, reckless and barbaric act," Basu pointed out.
He added that determining how Sturgess and her partner Charlie Rowley came across the contaminated item remains a priority task for the police.
Earlier this week, Basu said that detectives were unable to confirm whether the toxin the two people were allegedly exposed to in Amesbury was the same as the one that was ostensibly used against former Russian intelligence officer Sergei Skripal and his daughter Yulia in March.
The Russian Foreign Ministry, for its part, called London's claims of Moscow's involvement in the Amesbury incident "the good old mantra" of "the Russians did it" theme, urging the UK authorities to conduct in a real investigation instead.