The Revenue Commissioners have insisted 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 on Thursday.
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, but a spokesman stressed he was confident the laptops were highly secured.
"All Revenue laptops are extremely secure, they are encrypted to the highest standard," he said.
Detectives have carried out an examination of the scene.
A Garda spokesman said CCTV footage is being reviewed and employees are being questioned about what information was on the laptops.
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.