Mr Rowley, 45, remains in hospital in Salisbury in a serious but stable condition after falling ill on 30 June.
"On Wednesday, 11 July, a small bottle was recovered during searches of Charlie Rowley's house in Amesbury", police said in a statement, four months after a former Russian spy and his daughter were poisoned with the same substance.
"However, we can not guarantee that there isn't any more of the substance left", said Assistant Commissioner Neil Basu, head of United Kingdom counter-terrorism policing.
"However, we can not guarantee that there isn't any more of the substance left and cordons will remain in place for some considerable time", the spokesman told The Independent.
They are working on the theory that Mr Rowley and Ms Sturgess found a discarded batch, which then contaminated them.
He declined to give further details on the bottle, but police said inquiries were ongoing to establish where the bottle came from and how it came into Rowley's possession.
The discovery of the bottle comes as the Foreign Office announced independent chemical weapons experts would arrive in the United Kingdom next week to assist with the investigation.
The UK has invited experts from the Organisation for the Prohibition of Chemical Weapons to independently confirm the identity of the nerve agent.
Today's discovery has been called "significant and encouraging" by Wiltshire Police.
The search for the container was conducted by officers from Scotland Yard's counter-terrorism command.
"Given the ongoing incident in Salisbury and Amesbury, we are taking highly precautionary measures to ensure public safety", police said, referring to the poisoning of two more people in Amesbury last month.
"This will free up some Wiltshire Police officers to get back to supporting day-to-day community policing".
Public Health England reiterated its advice to members of the public and urged residents not to touch, or pick up, unfamiliar objects.
President Donald Trump argued Wednesday that the new natural gas pipeline venture with Moscow has left German Chancellor Angela Merkel's government "totally controlled" and "captive to Russian Federation ".
Uhuru, who is the most followed Kenyan on Twitter , had 3,234,935 followers as of July 12 but lost 16,071 of them in the purge. Across the board, Twitter's most followed celebrities felt a cut on Thursday.
Late a year ago , archaeologists also revealed that they had uncovered the graves of four children at an ancient site in Egypt . They belonged to an unidentified Ancient Egyptian Princess and the head and body of a crocodile from the River Nile.
But not before Merkel and other top officials in the German government had publicly fired back at Trump's breakfast diatribe. Navy Admiral James Stavridis said in an interview with host Vassy Kapelos on CBC News Network's Power & Politics Thursday.
Brian Percival , who directed The Book Thief , About a Girl and the Downton Abbey pilot, will direct the film. Producer Gareth Neame said it had been "our dream to bring the millions of global fans a movie".
The 32-year-old Anderson triumphed 7-6 (8/6), 6-7 (5/7), 6-7 (9/11), 6-4, 26-24 after six hours and 36 minutes on Centre Court. The eighth seed will face either twice champion Rafael Nadal or three-times victor Novak Djokovic in Sunday's final.
He then took a question from Fox News regarding his upcoming meeting with Russian President Vladimir Putin . Trump first met May Thursday night and the pair spoke for about 90 minutes and attended a state dinner.
A court in California ruled on a similar case against the cosmetics company a year ago , calling on it to pay $ 417 million . German shares of the company fell as much as 3.59 euros to 105.48 euros ($122.65) after closing at $127.76 Thursday in NY .
Friday's five-set match between Kevin Anderson and John Isner has become the longest semifinal in Wimbledon history. Given the length of this match, it may well prove hard for Djokovic and Nadal to complete their contest on Friday.
China's trade surplus with USA swells in June
Last week, the United States and China introduced tariffs of 25 percent on $34 billion of each other's exports. Its trade surplus with the U.S. over the same period was $133.76bn, up from $117.51bn past year .
Nets trade Jeremy Lin to Hawks
Adrian Wojnarowski of ESPN reported on Thursday that the Brooklyn Nets have traded the veteran guard to the Atlanta Hawks . Lin told the Nets website earlier this week that he has yet to participate in full-contact drills as he rehabs the injury.
Eclipse 2018: Is there a solar eclipse today on Friday 13th?
This partial eclipse began at 7:18 IST on July 13, reached its maximum magnitude of 0.3367 at 8:31 IST and ended at 09:43 IST. The visual of Solar Eclipse will not be visible to many and only a small part of Antartica would be able to watch the eclipse.