Investigators probing last week's serial bomb blasts in the city have prepared sketches of three suspects as Gujarat remains on high-alert, a senior police official said on Saturday.
"We have prepared three sketches of suspects based on description given by an eye-witness who saw them planting the bombs in different parts of the city," Joint Commissioner of Police Ashish Bhatia said.
"We have decided to not make those sketches public at this stage as it will hamper the probe," he added.
Police is conducting regular combing operations and security has been tightened in vital locations of the state.
On the forensic report of bombs, Bhatia said, "It seems that the material for bombs came from outside the state. But it is likely that they were assembled in Ahmedabad. Since, items like batteries and watches are found locally, we believe that the assembly could have been done here."
Victims admitted at the Ahmedabad Civil Hospital have described the series of events leading to bomb blast to police officials, said Bhatia.