The Forensic Science Laboratory (FSL) here was flooded with nearly sixty samples supplied by police for analysis from the bomb blasts sites at Dilsukhnagar.
The samples weighing 47 kg were handed over by police of Saroornagar, Malakpet and National Investigation Agency, FSL Director O. Narasimha Murthy said.
He said aluminium pieces, nails, nuts and bolts and parts of bicycles, which were strapped with bombs, were referred to the lab for examining the chemical composition.
The damaged motorcycles that were parked near the sites and the splinters recovered from bodies were also sent to the lab.
Mr. Murthy said that the bombs were of high intensity and made of ammonium nitrate.
They were concealed in tiffin boxes made of aluminium. The explosive materials were kept in wooden boxes in the earlier explosions at Gokul Chat and Lumbini Park in 2007. The wooden boxes also had iron balls.
But the aluminium boxes now had bolts and nails to provide the lethal element.
Mr. Murthy added that the laboratory did not have the equipment to enhance the quality of the surveillance camera footage, which provided a blurred image of the suspected bomber.
The laboratory will place orders for acquiring audio-video authentication and enhancement equipment, automatic speaker identification software and hardware, chassis and engine number examination kit to study vehicles and trinocular microscope with camera attachment.
