Britain, Russia Clash Over New Nerve-Agent Poisoning Case

British police are searching for the source of contamination that sickened a man and a woman in the area of southern England where a former Russian spy and his daughter were poisoned in March. The two victims tested positive for a Novichok nerve agent. Novichok is a series of deadly nerve agents designed by the Soviet Union that are generally unavailable outside Russia. VOA's Zlatica Hoke reports the two poisoning cases have sparked a political row between Britain and Russia.