The £60m arena is bringing with it jobs, international events and an expected big boost to the Leeds economy, according to the council leader.
Leeds City Council leader Cllr Keith Wakefield said: “We want Leeds to be the best city in the UK and delivering this hugely-imaginative and highly-ambitious project on time and on budget in an incredibly-challenging economy demonstrates without doubt that we mean business."
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The man entered the Yousaf Newsagent, in Fraser Street, Burmantofts, and demanded cash on Sunday at around 5.30pm.
The pony, which is thought to be two to three years old, was discovered off Scawby Road in Broughton Vale on Saturday at around 6pm.
ISG says it is pulling out because of the increasing costs and delays caused by a legal challenge