As Obama begins Vietnam visit, BBC reporter says he has been banned

A BBC correspondent in Vietnam for U.S. President Barack Obama's visit to the country said on Monday he had been ordered by the Vietnamese authorities to stop reporting apparently because they suspected he had met one of the government's sharpest critics.
"We have now been told that our accreditation has been withdrawn and all our reporting activities must stop," Bangkok-based Jonathan Head said in a report on the BBC's website.
Vietnam's foreign ministry had no immediate comment.