The company that owns a cash depot targeted in a daring helicopter raid this week said Friday it is offering a reward of more than $ 1 million for information about the heist . A police Swat team enter a G4S cash depot in Vastberga , Stockholm . G4S said it is offering up to 7 million Swedish kronor ( $ 1.01 million ) for information leading directly to the arrest and conviction of the offenders or the recovery of the stolen money . G4S also said the circulation of cash in Stockholm would not be adversely affected by the heist , which occurred just days before Sweden 's monthly payday , when the depot would have been rife with cash . The company did not disclose how much money had been lost , but the thieves could have gotten as much as the equivalent of several millions of U.S. dollars , according to CNN affiliate TV4 . A group of heavily-armed thieves used a helicopter early Wednesday to land on the roof of the cash depot in Vastbarga , Stockholm , which serves automatic teller machines all across the capital , TV4 reported . They used explosives to get into the building , witness Bjorn Lockstrom told TV4 , and later hoisted bags of money to the waiting chopper . TV4 later reported that the blueprints of the building were public documents which anybody could request to see . G4S had never asked for the blueprints to be classified . The helicopter had been stolen earlier during the night , police said . The thieves had also placed a bag marked `` bomb '' outside the police heliport , meaning Swedish police could n't immediately pursue the thieves because they had to first deal with the bag . TV4 later reported that the bag never contained a bomb . The thieves had also blocked the roads around the cash depot with metal spikes , TV4 reported . No one was hurt during the heist , police said , even though several employees had been in the building when the robbers entered . Stockholm police said the heist had been elaborate . `` The robbery was very well planned . They brought a lot of firepower with them , among other things automatic weapons , '' Anders Bjargard from the Stockholm police , told TV4 . Two people have been questioned in relation to the heist , but no one has been arrested . Police are still hopeful they will find the perpetrators . `` We have a lot of traces after the perpetrators , both where the robbery took place and where we found the helicopter , '' Bjargard said . The investigation is the biggest operation the Swedish police have mounted since the murder of Sweden 's then-Foreign Minister Anna Lindh in 2003 . `` It 's an enormous piece of puzzle , and we do n't want to miss anything , '' Anders Buren , head of police operations , told TV4 . Since the heist , Swedish police have been criticized for storing their helicopters at an unguarded heliport in the Stockholm archipelago , which enabled the thieves easily to put the police helicopter out of commission . Swedish media also criticized police for not shooting at the thieves as they escaped in their helicopter . But Bengt Svensson , the head of Swedish police , defended the police officers ' actions . `` Just because we now have criminals who act like they do in the movies does n't mean that we can do it as well , '' Svensson told Swedish newspaper Svenska Dagbladet .
Owners of Swedish cash depot offer £1M reward for information on heist . Thieves believed to have stolen the equivalent of several million dollars . Armed thieves used a stolen helicopter during the raid .