CNN Situation Room With Wolf Blitzer August 17, 2015 22:35:00
Biochemical experts are working to neutralize the threat. searching up to three kilometers from the immediate blast area. taking air soil, and water samples. these stray chemicals sitting in an unsecured area less than a kilometer from the blast zone. >> do you know what this is? do you know if it poses a danger to anybody? >> reporter: tianjin's chief environmental officer tees me searchers have not entered residential area due to safety concerns about broken glass. he says they'll begin searching those areas if needed. chemical experts say it's impossible to know exactly what that is or what...