The organisers have tweeted an apology: "We would like to express our sincerest apologies to everyone involved in the race who will be affected. We will update you future plans asap..."
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Officers say the man could hold vital information about the attack.
The party has revealed its ‘contract with the people’.
There are only 11 White Lions left in the wild. Uganda and Pascha have been rescued after the previous facility they were in closed down.