But faulty mechanism in the 27 live bombs found here, ensured that none exploded, though the terrorists were successful in carrying out their deadly mission in Ahmedabad.
The recovery of the bombs over four days since Sunday has now led to a large number of police teams from different parts of the state to come here and study the explosives.
The weight of a single bomb is 2.5 kilogrammes. The bombs are 1-foot long, 6.5-inches broad and 2-inches thick. The nutbolts and iron pellets in each bomb weigh 1.25 kilogrammes. The weight of the ammonium nitrate compound in each bomb is 1 kilogramme.
The bombs also contained Integrated Circuit chips, detonators, battery, electric wires and adhesive tapes. Investigations have revealed that the pellets and the nutbolts were dipped in oil before they were packed with the ammonium nitrate compound.
S M Darjee, Deputy Director, Forensic Science Laboratory, said: "The bombs recovered from different places in Surat were of high intensity. The casualties would have been very high had the bombs gone off, but fortunately, none exploded due to the faulty IC chips. We have sent the circuits to our head office at Gandhinagar. After decoding them, we will learn more about the causes of their failure."