The two suspects argued with a member of a rival bikers' gang at a party on the day before the shooting.
The three victims were all shot dead. Their bodies were recovered from a white van that had been pushed into the Zuid-Willemsvaart canal.
The two suspects are both male. One is a 44-year-old, the other is 37. They are to appear before a magistrate in the course of the day. They are both linked to Genk Hell's Angels, a rival bikers' gang.
The bodies of the three victims were found on 21 May. Two of the victims were in the back of the van, the third was found in a front seat. The victims’ clothes betrayed their links to the Outlaws bikers' gang.
The white van was a Citroën Berlingo. Its nose had been sticking out of the water.
The shooting was earlier linked to an incident at a tyre store earlier in the evening of the killing. The store's owner is believed to be a member of the rival Hell's Angels bikers' gang. Several Outlaws are thought to have been involved in a confrontation that ended in a shooting. The suspicion is that the killers then tried to dump and hide the dead bodies in the canal.