A large number of phones and other items, though to be worth in the region of thousands of euro, were stolen from the Vodafone shop in Roscommon town in the early hours of Wednesday morning.
The smash and grab raid, which is believed to have taken as little as three minutes, happened some time between 4 am and 5 am.
Roscommon Gardaí are now examining CCTV footage from Main Street and are anxious to trace the whereabouts of a silver car, believed to be a silver 5 Series BMW, which may have been acting suspiciously in Roscommon town or the Lanesboro area late Tuesday night or early Wednesday morning.
Number plates were also stolen from a vehicle in the Lanesboro area on Tuesday night and it is believed that that incident may have been linked to the robbery in Roscommon town.
Roscommon Gardaí are appealing for information on 090-6638300 and drivers who may have been in the general area between 4 am and 5 am on Wednesday morning are also being asked to check their dash-cam footage and report anything suspicious to Gardaí.