Maharashtra Chief Minister Sushilkumar Shinde on Friday said definite leads have been found about those responsible for the train bomb blast that claimed 12 lives in Mulund in Mumbai.

He, however, did not rule out the possibility of the involvement of Students Islamic Movement of India or Pakistan's Inter Services Intelligence in the blast.

"However, we will not pinpoint definite organisations responsible as the investigations are still in a preliminary stage," Shinde said, after presiding over a high level meeting to chalk out a disaster management plan in the wake of the explosion that left over 65 commuters injured.

Rejecting the failure on part of the intelligence agencies to avert the tragedy, the chief minister said, "We had definite information that something may happen after August 15, 2002."

Shinde said ammonium nitrate was used in the 'clandestinely made' device used for triggering the blast in the train at the Mulund station.

He linked the Mulund blast to the explosion that had occurred in a BEST bus in Ghatkopar on December 2, which left two persons dead.

The intensity of the blasts in the recent past including that of Thursday night was low compared to the 1993 serial blasts that had rocked the metropolis, he said.

These explosions were aimed at creating fear psychosis among the public, the chief minister said and asked the people to be on constant vigil and alert.