One customer posted photos online of people rushing to get out of Rushmere Shopping Centre in Craigavon.
Another member of staff said she and others were told to leave after what appears to have been a power outage.
Many felt that the outage may have had something to do with the storm early this morning but that was scotched by NIE who said it was related to a cable fault.
A spokesperson for Rushmere said the shopping centre had been reopened after the fault had been dealt with by NIE.
Earlier the father of one member of staff said: “My daughter has been sent home from work. The place is in chaos.”
She said: “We were just on our way into the main shopping area when suddenly the place went into darkness.
“When we were leaving we saw the fire brigade at the lifts, it seems there are people stuck in the lifts.”
A spokesperson from Rushmere Shopping Centre said things are up and running again and the centre has reopened.
A spokesperson from NIE said: “It was a 11kv cable fault that affected power supplies in Craigavon including Rushmere Shopping Centre
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