Soldiers test for signs of chemical pollution in the core area of the Tianjin blast zone on Aug 16.[Photo/China Daily]

Volunteers hold a small memorial ceremony on Aug 15 night in front of Taida Hospital to express condolences for those who died in the blasts.[Photo/China Daily]

A volunteer guides vehicles near a temporary settlement center in Tianjin on Aug 14.[Photo/China Daily]

Injured firefighter Yang Jianjia, 30, receives treatment on Aug 13 at the Tianjin No 5 Center Hospital.[Photo/China Daily]

Volunteers help residents charge their cellphones at a temporary settlement center at No 2 Primary School in the Binhai New Area.[Photo/China Daily]