Hyderabad: Investigators are yet to make a breakthrough in the Hyderabad blasts that killed 16 people and injured over 100 on Thursday.
Around 30 to 40 people have been questioned police and other agencies probing the attack, official sources said.
However no arrests have been made and the investigators are yet to make a significant breakthrough.
Media reports said that Indian sleuths might seek the help of the U.S. Federal Bureau of Investigation (FBI) to enhance CCTV security camera footage of the attack.
With the video being too grainy, investigators have had trouble identifying the suspects.
Meanwhile, Union Home Minister Sushilkumar Shinde reiterated that those responsible for the terror strike will be booked soon.
"We have got some materials there and tests are being done in the forensic laboratory. Soon, we will get the results and the culprits will be booked soon," he said.
Two bombs placed on bicycles exploded in Hyderabad on Thursday within minutes of eachother killing 16 and injuring over 100.
While no terror group claimed responsibility for the attack, the Indian Mujahideen is suspected to be behind the strike while the involvement of Pakistan-based Lashkar-e-Taiba (LeT) is also being probed.