The bus, which belonged to Rohini depot 3 had broken down, was being repaired near the Madhuban Chowk Underpass around 12.30 am when the speeding tempo rammed into it from behind, they said.
Eight men, who were repairing the bus, were injured in the accident, the police said.
They were rushed to a hospital where Pramod and Sunil died while the six others are currently undergoing treatment, they added.