"The crowd reacted with applause and with some 'ooohs,' apparently surprised by the news that Clinton was ill."
Nonsense. Serious arse-covering going on here. This completely misrepresents what happened. These were not "ooohs," these were "whooos." Completely different animals. The former indicates surprise, while the latter indicates agreement and support with what the speak er just said.
AP, your bias is showing.
They weren't "oooh'ing" or even "whoo'ing" much less "boo'ing". Think of it as a collective gasp of surprise from several thousand spectators all at once. That's what it sounded like to me.