The men, aged in their 20s, are reportedly from Tyrone and L'Derry.
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It is understood a concrete slab fell on them while they were working on a building site.
In a statement, Jaxon Construction said: "We are co-operating fully with the relevant authorities and will make further announcements as additional information becomes available.
"Site works have been halted until further notice and the site is now in the hands of relevant authorities."
(CD/LM)
