Police officers stand guard at a residential house in Amesbury, southern England, on July 7, 2018 | Niklas Halle'n/AFP via Getty Images Chemical watchdog confirms Skripal poisoning link to British couple Organisation for the Prohibition of Chemical Weapons says substance used against ex-Russian spy was responsible for Brit’s death.

An international chemical weapons watchdog said its tests confirmed the U.K.’s conclusion that a nerve agent poisoned a British couple in June, killing one of them.

The Organisation for the Prohibition of Chemical Weapons (OPCW) also said Tuesday it was the same chemical found to have poisoned former Russian double agent Sergei Skripal and his daughter in Salisbury, England in March.

Dawn Sturgess, 44, died in July after British police say she and her partner were exposed to the military-grade Novichok nerve agent in Amesbury — a town 8 miles from the center of Salisbury.

The British government blamed the Skripals’ poisoning on the Russian government, setting off a diplomatic row between the U.K.’s allies and Moscow, with the Kremlin denying any involvement in the poisoning.

U.K. Foreign Secretary Jeremy Hunt welcomed the findings in a statement and condemned the "recklessness of the Russian state" in bringing a nerve agent into the U.K.

"This is another reminder of the importance of the international community standing together to uphold the global ban on all use of chemical weapons, and ensure that the rules based international order is respected so we can all keep our citizens safe," Hunt said.