Counter-terrorism investigators say that Thursday's serial blasts in Hyderabad carry the fingerprint of Indian Mujahideen.
The use of cycles, ball bearings and timers have made investigators link the attack with last August's failed Pune serial blasts and IM co-founder Riyaz Bhatkal engineered multiple blasts at Lumbini Park laser show and Gokul Chaat Bhandar in Hyderabad in August 2007.
Just as an unexploded device was recovered from Dilsukhnagar in 2007, investigators are now examining another device found under the foot overbridge in the same locality this evening.
In all the three incidents, cycles were used for planting timer rigged bombs.
The twin blasts came a day after Intelligence Bureau (IB)'s multi-agency centre flashed an alert indicating that elements of erstwhile SIMI or IM were planning an attack.
This alert was shared with all metropolitan city commissioners and state director generals of police.
On Feb 13, IB had issued another alert on the basis of United Jehad Council meeting in Pakistan, where the militant groups were adamant on avenging the hanging of Jaish-e-Mohammed terrorist Afzal Guru.
India's external agency RAW too warned of a terror attack by Lashkar or any of its affiliates like IM.
"The Sai temple in Dilsukhnagar was also targeted in 2002 by Lashkar-e-Taiba cadres led by Abdul Bari. The present blast points to Indian Mujahideen, whose entire leadership is intact with Yasin Bhatkal, IM mastermind, in all probability still in India," said a top terror investigator. While IM founders Riyaz and brother Iqbal are in Pakistan, Yasin Bhatkal escaped the police dragnet on November 27, 2011 at Tambaram in Chennai.
While an IB/NIA team of counter-terror experts are leaving Delhi for Hyderabad tonight, blast evidence is being collected from the injured and the dead bodies to further determine the nature of device and charge used. In 2007, the unexploded bomb recovered from Dilsukhnagar was ammonium nitrate fuel oil explosive with ball bearings, detonators and a timer.
Although rain wiped out traces of charge in August 1, 2012 serial blast in Pune, the core charge was suspected to be the same.