Armed raiders stormed into a bingo hall in Dundalk on Wednesday night, robbing an unknown sum of cash.
The terrifying incident occurred shortly after 9pm in the popular 'Let's Bingo' hall in the border town.
Up to five men wearing Halloween masks armed with hammers and baseball bats stormed the hall and demanded staff to hand over money, while other thugs took money from the arcade.
It is not yet known if any of the raiders had a firearm.
A source said one of the violent raiders shouted at the crowd and demanded everybody to be quiet.
It is understood the raiders then fled in a waiting car. The bingo hall is very close to the border and a slip road to the M1 motorway.
Up to 100 people were in the bingo hall at the time of the vicious raid - including many elderly people.
Several women were visibly upset and left in tears, whilst another woman briefly passed-out.
Sources believe the raiders were very familiar with the layout of the bingo hall.
"They came in and knew exactly where they could get the money... it was all over within six minutes.
"It's just terrifying, it's like stuff you see on TV."
Gardaí attended the scene tonight and are investigating the incident.