British authorities have determined that former Russian spy Sergei Skripal and his daughter, Yulia, were exposed to a military-grade nerve agent through the vents of Skripal's BMW.
Authorities also revealed that about 38 innocent passersby were sickened by the powdered substance, though none were as critically ill as Skripal and Yulia, who remain in hospital.
“It is a Cold War substance, something they [Russia] claimed never to have,” one senior intelligence official said of Russia to ABC News. Sources said the substance is derived from G- and V-series agents in the 1970s, which are akin to the Novichok nerve agent.
The intelligence officials told ABC News up to 38 individuals in Salisbury have been identified as having been affected by the nerve agent but the full impact is still being assessed and more victims sickened by the agent are expected to be identified.