Mexico City, Mexico - About thirty runaway police horses stampeded down one of Mexico City's busiest roads on Monday, injuring one person and damaging 11 cars.

The equines, many of which were saddled up, galloped down the tree-lined Circuito Bicentenario - located near the lower house of Congress - in Mexico City after being scared by the sound of car engines.

The mounted officers had been deployed around Congress as part of the security measures implemented to deal with protesters, according to Federal District Public Safety officials.

Cars were forced to slow up as the animals went on the rampage in the Mexican capital and video footage of the stampede shows at least two cars with smashed windows.

"It was like 'Jumanji,'" Federal District Public Safety Secretary Jesus Rodriguez Almeida told reporters, referring to the board game.

The horses, including several bays, one grey, and one palomino, panicked while officers were taking them out of their trailers near the city's Congress building.

The person who was hurt suffered minor injuries although, according to police, many other people were "severely frightened" by the incident.

Some of the horses suffered cuts on their muzzles and legs and were given veterinary treatment after they were rounded up.

One eyewitness said: "I had stopped at the traffic light when I heard the horses coming. A horse hit the car, fell, got up and continued." He added: "There were at least 25 horses stampeding."

The Mexico City police chief said that the city's government will pay for any damage caused by the stampede.