New Delhi: Despite one day passed after the bomb blast nearby the office of BJP at Malleshwaram in Bangalore, no clues are found to nab the alleged terrorists, said union home minister Susheel Kumar Shinde.

The investigations are underway.  So far no vital clues are found.  The police are screening the footage of CCTV.  All those involved in the incidence will be subjected to harsh punishment, said minister Shinde.

When the media men queried the minister, whether intelligence department intimated the possible attack, Shinde said that union ministry of internal security has sent alerts on the chances of possible attack in metros to the concerned authorities in different states, added minister Shinde.

The report on the incident will be obtained from the state government before transferring the case to National Intelligence Agency (NIA).  Meanwhile, the bomb blast will not hamper the upcoming assembly elections in Karnataka, assured minister Shinde.