Persistent local reports suggest a knife was involved in the attack, which happened in mid-afternoon, but police are currently unable to say if this was the case.
Some may find our video of the scene disturbing.
A trail of blood is said to have led from near Graeme Pharmacy in Main Street to a block of flats.
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The entrance to a close in Abercrombie Street was cordoned off.
Photographer Michael Gillen captured the aftermath of the attack.
We will publish further details as soon as they are available.
Anyone with information should contact police via 101.