BEIJING—IOC president Jacques Rogge was accused of backtracking on promises of press freedoms Saturday and some Internet sites remained blocked less than a week before the Beijing Games begin.

Under pressure from the International Olympic Committee, Chinese organizers unblocked some sites at the main press center and venues, but others remained censored for journalists covering the Summer Games.

“Let me be very clear on this,” said Rogge, speaking publicly for the first time since arriving in Beijing on Thursday. “We require that different media have the fullest access ...

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