Police said the accident took place at 11.45 am RPT am this morning near Nizamuddin flyover following which an irate mob pelted stones at the bus.
The erring driver, identified as Atal, managed to escape.
Police said Nikhil (25) was driving the car while his two friends Sumit (23) and Sahil (28) accompanied him at the time of the accident.
A police officer said Nikhil was taking a right turn from BRT road when the accident took place.
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"The impact of the crash was such that the car turned turtle, leaving all its three occupants injured and stuck inside the vehicle," the officer said, adding, other commuters helped the victims out from the badly mangled car.
The victims were rushed to Safdarjung Hospital where the condition of Sumit and Nikhil is said to be critical.
The situation was brought under control after police arrived at the scene and seized the bus.
A case under relevant sections of the IPC has been registered against the errant driver at Lodhi Colony police station and a manhunt launched to nab him.