The BBC is to launch a temporary Olympics radio station during London 2012, when BBC Three will be devoted to live Games coverage.
The plans, which include 1,000 hours of live online video coverage which will not be shown on TV, were approved by the BBC Trust on Monday.
New digital station Five Live Olympics Extra will be in addition to Five Live and 5 Live Sports Extra broadcasts.
All-day coverage on BBC Three will cost about £4.5m, the corporation said.
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