U.K. police confirmed Wednesday afternoon that a British couple is in critical condition after having been exposed to the nerve agent Novichock — the same used on a former Russian spy, Sergei Skripal, and his daughter in the U.K. in March, reports the AP.

Bottom line: It is unclear whether this instance is related to the poisoning of Skripal, which was blamed on the Russian government. However, both incidents occurred near Salisbury, England, just miles apart.