The Revenue Commissioners insisted today 10 laptops stolen from one of their offices are highly secure.
Three hooded men are believed the have forced their way into the building at Ashtown Gate, Navan Road, in north Dublin through a side fire door.
The gang, who were caught on CCTV, removed the laptops and it is thought no other damage was caused during the incident at around 7.15pm yesterday.
Revenue said it was working to establish exactly which units within the offices were targeted, which will determine the nature of the information held on them.
Detectives carried out an examination of the scene today.
A Garda spokesman said CCTV footage is being reviewed and employees are being questioned about what information was on the laptops.
In a statement, the Revenue Commissioners said the laptops were locked to desks.
"Ten laptops, which were chained and padlocked to desks, were stolen during the break in," a spokesman said.
"As a matter of policy, Revenue's laptops are encrypted using a leading brand that complies with the highest international security certifications.
"An Garda Siochana and Revenue officers have reviewed camera surveillance footage and Revenue will continue to work closely with An Garda Siochana in relation to their investigation."
The thefts were immediately reported to the gardai, while the Data Protection Commissioner was notified first thing this morning.
The Data Protection Commissioner confirmed it has launched an investigation into the laptop thefts.
A spokesman said it would be looking at what type of information was stored on the computers, the security and encryption measures in place and whether they had been applied.
The commissioner will also examine the security of the Navan Road offices and how the gang was able to break in.