Police were called to Union Street at 5:53pm. The area remains cordoned off. Witnesses are urged to call 101 as soon as possible.
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It will be another day of frequent sunny spells, brisk winds, and isolated showers.
Friday will remain cold in the breeze with a mixture of sunny spells and isolated showers.
Outbreaks of rain, sleet and some hill snow are forecast across the region through Saturday morning.