Bengaluru: A pipe bomb an improvised explosive device (IED), which was detonated by a timer device, which had a battery circuit using a regular 9volt battery, was reportedly used to execute the terror attack on Church Street.

“The IED is similar to the one used in the Chennai train blast on May 1, which was triggered by the five SIMI fugitives of Faisal gang, who had escaped from Khandwa prison in Madhya Pradesh,” said an official source.

He added that the timer device has not been found as yet. “It has either been destroyed in the blast or has been thrown off to a distant spot because of the blast impact.”