New Delhi: A switch which is believed to have been used to trigger the briefcase bomb blast outside Delhi High Court was found today but a breakthrough in the probe still eluded investigators three days after the deadly explosion.
      
As investigators struggled to find conclusive leads in the blast case, they are now looking into the possibility of whether Indian Mujahideen (IM) operatives were helped by some other group in carrying out the attack which left 13 dead and 88 injured.
        
Sources said that a switch used in the bomb was found by investigators. But, they said the timer device, if at all used, is yet to be recovered.
    
They said the anti-terror squads of various states were working on the case but none of them have got any substantive leads.
      
The investigators were not ruling out the possibility of IM cadres being helped by some other group on the basis of a comparative analysis of July 13 Mumbai triple explosions and the High Court blast since components found in the bombs were identical.
    
Investigators also suspected that some of the 11 fugitive IM operatives who were allegedly involved in 2008 Delhi serial blasts, may have played a part in the High Court blast.
      
Four men--two each in Alwar in Rajasthan and Mumbai--were detained by police since they resembled the sketches of possible suspects released by the Delhi Police but they were freed after questioning and getting their identities verified.

The two men detained in Alwar hailed from Anantnag in Jammu and Kashmir.
      
But the questioning of the six men detained in Kishtwar in J and K continued. They included the owner of the cybercafé to which the HuJI email claiming responsibility for the blast was traced.
      
The detained included a youth Sohaib shose parents claimed that their son is innocent and "not involved at all" in the blast. He has been detained for purportedly sending the HuJI email.

Sources said an analysis showed that in Mumbai blasts, ammonium nitrate was mixed with fuel oil and detonator had traces of PETN while the bomb used to trigger the explosion outside Delhi High Court had PETN as its major component with few traces of ammoni um nitrate.
      
Investigators said PETN is used mostly by terrorists in Jammu and Kashmir and IM had earlier used ammonium nitrate for making bombs.
      
"So now we are looking into the possibility of whether Indian Mujahideen is being helped by some other group," a top police official said.
      
Another source maintained that unlike this time, in earlier cases there were ample evidence available for the anti-terror squads to make out which IM modules were involved.

Role of other terror group being probed


Investigators are now looking into the possibility of whether Indian Mujahideen (IM) operatives carried out the Delhi High Court blast with the help of some other terror group.

The investigators were not ruling out this possibility after a comparative analysis of July 13 Mumbai blasts and the explosion outside the High Court revealed that similar components were used in the bombs.
    
Sources said the analysis showed that in Mumbai blasts, ammonium nitrate was mixed with fuel oil and detonator had traces of PETN while the bomb used in Delhi High Court had PETN as its major component with few traces of ammonium nitrate.
    
Investigators said PETN is being used mostly by terrorists in Jammu and Kashmir and Indian Mujahideen had earlier used ammonium nitrate for making bombs.
    
"So now we are looking into the possibility of whether Indian Mujahideen is being helped by some other group," a top police official said.
    
Meanwhile, investigators have found a switch used in the bomb. Sources said the timer device, if at all used, is yet to be recovered.

Sources said the anti-terror squads of various states were working on the case, but none of them has got any substantive lead in the probe into the Wednesday's blast.
    
Investigators are not ruling out the possibility of some of the 11 fugitive IM operatives, who were allegedly involved in the 2008 Delhi serial blasts, having played a part in the Wednesday's terror attack.
    
Another source maintained that unlike this time, in earlier cases there were ample evidence available for the anti-terror squads to make out which IM modules were involved.

(Agencies)