Mail bombs were delivered to five different businesses in Amsterdam, Rotterdam and Utrecht over the past week, police said on Thursday. Each of the bombs was potentially dangerous, but luckily none of them exploded.
Authorities cautioned the public to be alert for any letters from CIB in Rotterdam. All of the suspicious, bulging letters carried the CIB logo and Wilhelminakade address of debt collection firm Centraal Invorderings Bureau. In each instance, the CIB logo and address were printed on one label, and the recipient's information was printed on a second label.