"I simply can not offer any guarantees", Assistant Commissioner Neil Basu, the head of Britain's counter-terror police, which is leading the investigation, told reporters, emphasising that public health authorities had said the risk was "low".
Salisbury District Hospital treated Sturgess and Rowley.
The British police have opened a murder investigation after woman exposed to Novichok nerve agent in Wiltshire County died this Sunday.
The statement added that blame on the Russian government for either the Skripal or Sturgess poisonings are "quite absurd.we continue to be deeply anxious by the continuing presence of these poisonous substances on British territory".
Russian officials dismissed any claims that the Kremlin was responsible for the death of a British woman near Salisbury, in an incident that United Kingdom officials described as another case of the Novichok poisoning. Since this is still early in the investigation, police have not released many details about how and where the two latest victims were poisoned. Sturgess was taken to hospital around 10.15am and Rowley several hours later, around 3.30pm.
John Glen, the Conservative Party legislator for the region, said the new poisoning has threatened an economic rebound from the slowdown caused by the attack on the Skripals.
Britain, which blamed Russian Federation for the attack against the Skripals, so far has not directly pointed the finger at Russian Federation in the case involving Sturgess and Rowley, saying the investigation, led by the Counter Terrorism Policing Network, is ongoing.
British Prime Minister Theresa May said she was "appalled and shocked" by Sturgess' death, and Home Secretary Sajid Javid said he was "determined" to catch the killers.
In Sunday's statement, police said there was no evidence Sturgess and Rowley visited any of the sites that were decontaminated following the attempt against the Skripals. "The possibility that these two investigations might be linked is clearly a line of inquiry for us".
He said no one else in the Amesbury and Salisbury region where the couple lived in southwestern England has shown any sign of Novichok poisoning. "I think someone from counter-terrorism needs to come here and tell us what they know", he said.
"I simply can not offer any guarantees", Assistant Commissioner Neil Basu, the head of Britain's counter-terror police, which is leading the investigation, told reporters.
According to CBS News, the container is likely a syringe or vial. According to Reuters, the non-profit Nuclear Threat Initiative believes that at one point, Russian Federation had stockpiled "thousands of tonnes" of the nerve agent.
'But we must not lose sight of the fact that responsibility for the fact that a military-grade nerve agent was used in Salisbury and South Wiltshire, rests with Vladimir Putin's Kremlin alone'.
- Trump pushes allies for immediate military spending increase
- England V. Croatia, Winner Will Play France
- Bank of Canada raises overnight rate target to 1 ½ per cent
- Coach Fredrik Rosengren absolutely believes Kyle Edmund can win Wimbledon
- Wimbledon accept Novak Djokovic's request regarding Roger Federer
- Billy Knight was facing child sex abuse charges
- Starr reacts to Kavanaugh nomination
- Croatia beats England to qualify for their first World Cup final
- China vows to 'fight back' after USA threaten $200bn tariffs on goods
- Kylie Jenner on Forbes cover for richest self-made women