Two employees of a chemist in Belfast city centre were forced to hand over tens of thousands of pounds to thieves while their families were held hostage.
The police were outside the store most of the day
They were ordered to go to their work at Boots in Donegall Place and get money while their families were held at their homes in south and west Belfast.
The cash, in sports bags, was handed over to the thieves at Wellington Place at about 0915 BST on Saturday.
It is believed that about £200,000 was taken in the robbery.
However, police have yet to release the exact amount stolen.
Detectives want to speak to anyone who may have witnessed the money being exchanged.
No-one was injured during the incident, however, the hostages are said to be deeply shocked.
The chemist, which is Boots' main store in Belfast, remained closed throughout Saturday while the police investigation took place.