Ukraine says it is investigating a claim that a poisonous substance was dropped on the besieged city of Mariupol, with an inquiry into the possibility that phosphorus munitions – which cause horrendous burns but are not classed as chemical weapons – had been used. ALEXEI ALEXANDROV/AP FILE
Mike Corder ASSOCIATED PRESS THE HAGUE, Netherlands – Ukraine said Tuesday it is investigating a claim that a poisonous substance was dropped on the besieged…
