A Dutch driver careened through police barriers and plowed into a crowd of people cheering their popular queen April 30, in an allegedly premeditated assault on the royal family that killed six bystanders, authorities said.

The speeding car came within a few meters of the open-top bus carrying Queen Beatrix and her family down a parade route, then smashed into a stone monument. The bus was not hit and no one in the queen's entourage was injured.

Prosecutors said the driver, who died May 1 from his injuries, acknowledged targeting the queen and her family.