Reports of Three Barges Dumping Black Material into the Yangtze River in Wuhan Prompt Emergency Inspection

网传长江武汉段三艘驳船，单次十秒倾倒大量黑色物质入江，相关部门已紧急巡查，倾倒物可能是什么？危害多大？

A public trend signal observed across 1 source.