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18 March 2011, 15:20 | Updated: 18 March 2011, 15:22
Picnics and vuvuzelas are among some of the items that could be banned from the Olympics under a series of security measures.
Things like flasks, thermoses, umbrellas, mobiles and whistles are on a list of banned and restricted items at the moment.
But organisers have told London's Heart that people will find out when they get their tickets what exactly they can and can't take into each event.