Police searched Reinaldapark in Haarlem on the evening of October 12 after a report that a firearm might have been seen in a parking lot. Several people reportedly ran into the park when officers arrived. Police searched with a drone and a dog, searched several people and recorded their details, but found no weapon. No arrests were made.

A car then burned out in the park during the night of October 14 to 15, with the fire discovered at about 3 a.m. The cause remains unknown, and police have not ruled out arson. A loud bang was reportedly heard by local residents.