The FAA has issued a Notice of Proposed Assessment of two civil money penalties to David Zablidowsky, the New York drone operator who suffered a downtown Manhattan crash last year.
Here is a link to the notice.
There were two charges, the broader being that Zablidowsky operated the drone in a careless or reckless manner, endangering the life or property of another, in violation of 14 CFR 91.13(a). Here is a link to the regulation. http://bit.ly/1odPTlV
The second charge was that the drone was operated within restricted airspace, leading to discussion that drones may not be operated over major cites. See FAA Now Says Flying a Drone in Most Major Cities Is Illegal