如何去写船只失事方面的调查报告？-商务书信

  Directions：A ship accident took place in Chang Jiang.Please unite a research report to tell：
　　1）the cause of the accident 
　　2）the results 
　　3）the response of authority 
　　To：Li Ming 
　　From：Liu Hua 
　　Subject：Ship Accident off West Coast of Chang Jiang，No Casualties. 
　　Date：April.9，1999 
　　Yesterday evening two boats collided in thick fog in Chang Jiang not far from Wu Han.One was a cargo ship carrying lumber，apparently on its way to Chang Jiang.The other was a National ferry on its regular run from Jiu Jiang to Wu Han. 
　　However，because of the weather conditions，the captains did not realize the danger until a few seconds before the collision took place.Consequently，there was no time for them to prevent the accident. 
　　Fortunately，there were no casualties among the crews or passengers，but both ships suffered badly damages. 
　　A spokesman for the port authorities said that a committee would be set up to determine the cause of the collision.

　　*这是一份非正式报告，有几点必须注意：开头就交待清楚写报告书的目的。详细阐述调查经过，尽量做到客观公正。