report of something—
1. a factual account of smth.:
- Is it an ill thing that the newspapers should publish detailed reports of divorce-suits?
2. an unconfirmed story or a piece of news:
- There have been many reports of gas used in the war, but no one knows whether they are true.
report on something—a detailed account of smth. in which opinions, as well as facts, are usually given:
- When you get back, write a report on everything that was said at the conference.