Investigators now believe that a nerve agent was used to poison a former Russian double agent, Sergei Skripal, and his daughter in the English town of Salisbury on Sunday. Both victims remain in critical condition, as is a police officer who was on scene. Anti-terror police are treating the case as attempted murder.
Between the lines: Suspicion has, naturally, fallen on Russia (Vladimir Putin, himself a former intelligence officer, has vowed publicly that traitors will be killed) and the nature of the poison further indicates a state may be responsible. Moscow denies involvement.