The accident took place last night after the bus driver lost control over the vehicle, SHO at Sector 39 Police Station Amarnath Yadav said.
He said 10 passengers, whose condition was stated as serious, were referred to a hospital in Delhi while the rest were treated here.
Traffic was stalled for a few hours, till the bus was removed with a crane, the SHO said.
The bus was on its way to Delhi from Vrindavan, he added.