The British police have recovered a small bottle containing the nerve agent Novichok that killed a woman and left her partner severely ill in Wiltshire.
Rowley's 44-year-old partner Dawn Sturgess, who was also poisoned on June 30, died on July 5, prompting police to open a murder investigation. Rowley remains in hospital where he has regained consciousness.
Police said the nerve agent come from a small bottle which they discovered in Mr Rowley's house in Amesbury.
Assistant Police Commissioner Neil Basu said no more details would be provided about the bottle.
"However, we can not guarantee that there isn't more of the substance left and cordons will remain in place for some considerable time", he said.
Scientists at the Defence, Science and Technology Laboratory are still trying to establish whether the deadly substance found at Mr Rowley's house came from the same batch of Novichok that contaminated Sergei and Yulia Skripal in March.
Britain has invited independent technical experts from the global chemical weapons watchdog to travel to the United Kingdom early next week to independently confirm the identity of the nerve agent, the British Foreign Office said on Friday.
Novichok is a Soviet-era nerve agent that the British government says is linked to Russia's spy agencies.
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Wiltshire Chief Constable Kier Pritchard welcomed the development, describing it as "significant and encouraging".
The search for the container was conducted by officers from Scotland Yard's counter-terrorism command.
"This contact is being done in close consultation with the hospital and the doctors", the Met statement said.
Further tests will now be carried out, the force said.
"The way that we do this might start to look slightly different from next week, when private security guards will join my officers on some of the cordons".
"We are now nearly two weeks on from the initial incident in Amesbury and I continue to be overwhelmed by the resilience shown by our communities".
Public health officials said the risk of exposure to the public is low, but advised people not to pick up any unusual items.
"As a precaution Public Health England continues to advise the public not to pick up any odd items such as syringes, needles, cosmetics or similar objects made of materials such as metal, plastic or glass".