World Cup organising chief Danny Jordaan told BBC's Sportsweek that he sympathises with fans annoyed by vuvuzela sounds drowning out singing at matches.
"We have asked for no vuvuzelas during national anthems or stadium announcements," he said.
"It's difficult but we're trying to manage the best we can."
He added that if any vuvuzelas are thrown onto the pitch they "will not think twice" to take action.
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