The injured were admitted to a hospital, where the condition of one of them is stated to be critical.
Two auto-rickshaws and six two-wheelers were also damaged in the incident. Rescue teams of Greater Hyderabad Municipal Corporation (GHMC) launched the operation to clear the debris.
Locals said the function hall was re-opened on Sunday after renovation. Some people alleged that negligence by the management led to the tragedy.
The GHMC announced an ex-gratia of Rs 2 lakh each to the families of the deceased.