That is the opinion of Michel Chossudovski, who notes that the US Chief of Staff (Prime Minister), Rahm Emanuel, visited Israel and talked with Netanyahu just before Israel decided to intercept the Freedom Flotilla by military means in international waters, resulting in the massacre of Monday.
Full article at Global Research.
Image of the May 26 meeting (from Voltaire Net)
Emanuel, the second most powerful man in the USA (and by extension the World), is an Israeli citizen whose father was a member of terrorist and genocidal fascist organization Irgun, notorious for its attacks against civilian targets. His personal style is no better than his father's, as he is notorious for his irate and hyper-aggressive style at politics, that have gained him the nickname of Rahmbo.
He has been accused of being an Israeli secret agent.