The FBI warnings about an unconfirmed threat targeting the media was bogus, and was just a way to get the media to shut-up about, to stop complaining about, and stop reporting on, the weak security at the convention. Essentially the government is trying to convince them that they could save their own butts by being silent. Sadly, by journalists being cowed into not reporting on the problems with bad security, they are allowing the government to get away with ridiculously poor security, which in turn is actually increasing the threat to the journalists' safety.
The "emergency call" in Hyde Park cited [in the article linked above] was bogus, and is a well known tactic used by law enforcement when they want to search someone/something but lack a proper search warrant, or probable cause. Simply put, an "anonymous person" (usually another cop) calls in an emergency to 911, the police show up and, under the guise of "the emergency," try to enter the premises. When and if the "victims" refuse to admit the police they forcibly enter (often with guns drawn) and search the premises in violation of the law.
"America was never innocent. We popped our cherry on the boat over and looked back with no regrets. You can't ascribe our fall from grace to any single event or set of circumstances. You can't lose what you lacked at conception.
"Mass-market nostalgia gets you hopped up for a past that never existed. Hagiography sanctifies shuck-and-jive politicians and reinvents their expedient gestures as moments of great moral weight. Our continuing narrative line is blurred past truth and hindsight. Only a reckless verisimilitude can set that line straight."
--James Ellroy, American Tabloid
Ensure a Free and Fair Election (Ban Paperless Voting Machines
"The basic tool for the manipulation of reality is the manipulation of words. If you can control the meaning of words, you can control the people who must use the words."