Royal Marines will be stationed in inflatable boats along the length of the Boat Race course on Sunday to ensure the event is not disrupted by another protester, organisers said today.
Last year's race had to be halted when Trenton Oldfield swam into the path of the two crews and narrowly avoided being struck by an Oxford oar.
Oldfield, who claimed to be protesting against elitism, was released from prison in December having served seven weeks of a six-month sentence after being found guilty of causing a public nuisance.
More top news
Ireland's new laws on gay marriage will be enacted by the end of July, with the first ceremonies likely in the autumn.
Stars such as Simon Cowell and Stephen Fry called on their Twitter followers to retweet missing person appeals for 24 hours.
Norwich have been promoted to the Premier League after a 2-0 victory against Middlesbrough at Wembley Stadium.