The Prince of Wales and Duchess of Cornwall were not hurt, according to a Clarence House representative.
Student protesters erupted in violence immediately after the House of Commons voted to triple university fees. Nearly 50 people were injured and more than a dozen were arrested.
The incident happened near an area where students and police clashed at a demonstration Thursday morning over proposed tuition hikes.
Police with riot shield and batons pushed student protesters away from London's parliament square. Inside, lawmakers were voting on the controversial plan that, in U.S. dollars, is nearly a $10,000 increase from $4,700 to $14,000.
Thursday's violence is the latest in weeks of nationwide protest over the proposed hikes. It's was not a welcomed decision, but the British government said the tuition increase was necessary as part of a massive $127 billion spending cut across the board.
The armed forces and the royal household will all be affected.
Liberal Democrats promised before recent elections they would oppose tuition hikes, but now their coalition is proposing the increases.
Although students are aware that the vote cannot be reversed, many are planning to continue the violence.
The Associated Press contributed to this report.