A "serious breach" of data protection has hit the staff of some MLAs, it has been revealed.
Ex-Finance Minister Sammy Wilson said the "serious breach" resulted in the details of salaries, employment dates and names of a number of employees of MLAs being released to a third party, which deleted the information.
It also emerged that the breach occurred on January 24 but employees were not notified until yesterday and the end of last week.
The Assembly Commission said it would deal with the circumstances.
Mr Wilson asked Speaker William Hay if he has spoken to the Assembly's director general Trevor Reaney to get a report.
Mr Hay said: "All commission members were informed as soon as it happened and have been well kept up to date."