On April 7, 2016, there was a massive brawl between thirty members of the Hells Angels and the Mongols in the Van der Valk Hotel in Rotterdam . Hotel guests escape to the adjacent fitness center. Police found seven bullet casings in the parking lot. The police arrested twenty suspects.

According to the weekly magazine Panorama, the European branch of the MC was subsequently summoned.

The mother chapter in the US felt that the Mongols in Italy, Germany, the Netherlands and other countries should meet more conditions. More contributions had to be paid, reliable sources told Panorama. It was also stated that revenge would have to be taken on rival clubs if there had been victims of fights or attacks. Friction would have arisen between the Europeans and the Americans. The European Mongols would like to act more peacefully.

According to Panorama, this led to a bad standing for all chapters of the Mongols throughout Europe. An entire continent getting bad standing has never happened before in the motorcycle world. On September 26, 2016, the European Mongols decided to continue independently, but that also led to discord. The Germans did not want to secede after all. The Dutch Mongols were subsequently dissolved.