An angry crowd attacked Uber drivers and their vehicles with clubs and stones Tuesday outside the Mexico City airport. Amateur video captured the incident, showing people smashing car windows and throwing eggs and flour at vehicles. One man destroyed a moving car’s rear window with a large rock.

Uber said between 10 and 12 cars were damaged in the attack. There were no reports of serious injuries. Mexico City became the first city in Latin America to make official regulations for smartphone-based taxi services earlier this month. The Organized Taxi Drivers of Mexico, a union campaigning against Uber, denied any involvement in Tuesday’s attack.