Supporters of Anonymous have also protested in Dublin and Belfast as the movement takes part in the global protest against corruption on Bonfire Night.
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The Malaysia Airlines plane vanished on March 8, 2014, while flying from Kuala Lumpur to Beijing with 239 people on board.
The horse had unseated his rider and was running loose when presenter Hayley Moore grabbed the reins.
Berlinah Wallace will serve a minimum of 12 years behind bars.