The Union Home Ministry on Sunday informed that RDX and ammonium nitrate were used to carry out Saturday's bomb attack in Pune's Koregaon Park.

Nine people were killed and 57 injured in the blast that ripped through the popular German bakery, which is frequented by foreigners.

Meanwhile, Inspector General (Law and Order) Rashmi Shukla informed media persons that it was very premature to say who was behind the terror attack.

"Investigation is on. With the assistance of National Investigation Agency, state's Anti-Terrorism Squad is probing the case and it is moving in the right direction," she said.

On reports that some suspects have been detained, she said she had no information in this regard from the ATS.

The Improvised Explosive Device, kept in a packet outside the kitchen of the German bakery, exploded at around 7.30 pm when a waiter attempted to open it.

"The 30'X30' structure, with a temporary extension for the customer, was owned by Shankar Kharose and Ram Kharose but was being run by Gopal Manipuri," she said, adding the blast has caused a 6'X4' hole on the wall.

For more on the Pune blast, click here!