A man in a black Suzuki Swift, a compact car, was speeding toward a bus carrying Dutch Queen Beatrix and several members of the royal family in the city of Apeldoorn. The car sped through a crowd, hurling people through the air and breaking barricades before it came to a violent stop when it hit a monument.
Dutch TV station ntv said two people were killed and 14 injured, but officials have not yet released figures.
Some reports spoke of what appeared to be an attack attempt on the royal family who were sitting in an open bus nearby. They watched in horror as police and bystanders provided emergency care for the many injured, Radio Netherlands reports.
The motorcade was part of celebrations for the Queen's Day national holiday. All remaining celebrations were canceled.