The deceased has been identified as Harish Sagar, a student of Class-IX of a government school in Tughlakabad Extension, they said.
The bus driver, identified as Zuber Khan (30), has been arrested, police said.
"We received a PCR call at around 1 PM. The incident took place when Sagar was crossing the road at RD Marg near MB Road for going to his evening school. He was immediately rushed to a nearby hospital where he was declared brought dead. Following the incident, the crowd got violent and broke glasses of 16 buses," DCP (South East) P Karunakaran said.
The protesters were demanding strict action against the bus driver.
"The situation is under control, appropriate legal action is being taken," said a police official.
