The wife of a council chief executive who was sent a live bullet in the post, has said her family's lives have been "turned upside down" by the threat.
Grainne McCoy said the threat had caused tension
The bullet was sent to Craigavon council's Francis Rock on Monday.
A note accompanying it demanded the council drops plans to reorganise staff in its departments. It also mentioned Mr Rock's wife and her daughters.
His wife, Grainne McCoy, said the family was taking security measures and said the threat was "unbelievable".
"The police have told us to take it extremely seriously," she said.
"I don't think it has ever happened before that a senior civil servant has had such a threat over internal organisation."
Ms McCoy said staff at the council were "extremely" shocked by the threat.
She said her two daughters had also borne the brunt of the it.
"Tension in the house has been unbelievably high just from day-to-day, you know 'how are we going to deal with this, what's going to happen?' - it's just unbelievable that anyone would go to those lengths," she said.
"Every time you hear somebody pulling up to the door you're alert and you're frightened."
Security measures are now in place around the house and arrangements have been made to drop off and collect her children from school, Ms McCoy said.
The leaders of all parties on the council have condemned the threat.
However, at a meeting on Wednesday night unionist councillors passed a vote of no confidence in a Sinn Fein councillor who claimed there were "sectarian undertones" in the sending of the death threat.
Ms McCoy said the political argument was not her concern.
"I can only concentrate on the enormity of this on my family," she said. "The huge pressure - really it has turned our lives upside down."