The searches of the accused took place in The Hague, Enschede and Haaksbergen. In Germany, investigators in Lower Saxony and North Rhine-Westphalia searched a bunker complex and seven other objects. This included sales outlets and business addresses of the suspects' companies.

The fireworks were intended for illegal sale to private individuals. According to the information, the suspects offered them for sale on their website, after which they could be picked up in fireworks shops near the border in Germany. The police confiscated both the shop inventory and some of the pyrotechnics that had already been sold from the buyers.

The suspects had been observed for more than a year. They are said to have ordered firecrackers and firecrackers on a large scale in Asia. According to the information, an anonymous tip also contributed to the start of the investigation.