Progressive Conservative staff members arrived in one block of their main-floor offices Thursday morning to find the equipment gone. There were no signs of forced entry.
"It's very devastating when you've been personally victimized through no fault of your own," caucus chair Ralph Eichler said.
"We need to rely on authorities to move very quickly on this and I believe they are."
The theft appears to have occurred sometime after 8 p.m. Wednesday, when the last staffer left the bank of seven offices and locked the door, Eichler said.
With no signs of a break-in, Eichler admitted someone may have simply left a window open.
"The building is warm, as we all know, everybody that's in this building. You never say never, so at this point in time we really don't have these details."
The computers contained material the Tories use to prepare for question period, but are password protected, Eichler added.
Premier Greg Selinger said an investigation is underway and could lead to tighter security.
"We always want a building that's accessible to the public, but if there is a risk to people's personal property, that will be something that has to be taken into account," Selinger said.