Investigators said the explosive belt may have been a fake, and that similar recent events were probably not carried out by the same gang.
"The robbers may have been inspired by recent events," a police union representative told the newspaper.
On Monday, two men were arrested after fixing an explosive belt to a cash transporter, demanding 600,000 euros (NZ$1.01 million), while a gang escaped with 250,000 euros in a similar heist in mid-July.
Last week in Sydney, a fake explosive device was strapped around the neck of the 18-year-old daughter of a wealthy family in an apparent attempt at extortion. The perpetrator has not been found.
-AAP