'Both sides agree that something needs to be done,' Grossi tells reporters after Russia takes control of Chernobyl and Zaporizhzhia nuclear plants, raising alarm across globe
Radiation countermeasures expert Dr. Alla Shapiro, a Chernobyl first responder, says war conditions make it harder to save lives in event of attack on nuclear power plant
Ukrainian authorities say Russian forces cut off mobile networks and the internet at Zaporizhzhia; Grossi says regular communications crucial for facility's safety and security
Loudspeaker can be heard warning soldiers outside the Zaporizhzhia plant — the biggest nuclear facility in Europe — that they're 'endangering safety of the entire world'
Linda Thomas-Greenfield tells emergency session that assault on atomic plant in Zaporizhzhia 'represents a dire threat to the world'; Moscow's envoy: 'Simply untrue'
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