Ahmedabad, July 26 - It's been exactly a year since 22 bomb blasts ripped through this Gujarat city leaving 59 dead and over 100 injured. But after a Rs.9-lakh investigation bill, the police still are unable to trace down 37 suspects in the case.

The investigating agencies say they are yet to put all the pieces of the plot together because the suspected terror group behind the blast, Indian Mujahideen (IM) has a complex and wide web of links across the country, particularly in Madhya Pradesh and Uttar Pradesh.

'There are 18 'bomb planters' of the serial blasts who have already been identified and booked during the past one year by the Gujarat police,' a senior official of the criminal investigation department said.

'Some of the alleged master minds involved in the Ahmedabad serial blasts have also been identified and arrested, such as Safdar Nagori the founder member of the IM who planned training camps for the recruits at Halol (in Gujarat) before the serial blasts in Ahmedabad,' he said.

He said the other key master minds of the Ahmedabad serial blasts were Abdul Subhan, who is believed to have fled the country and is in Nepal, and Amir Raza Khan, who is believed to be in Karachi in Pakistan.

In all there are still a total of 37 people, who are untraceable and conspired or directly participated in the blasts in Ahmedabad, he said.

The pattern of terror in Ahmedabad also had new methods, such as hospitals being targeted for the first time.

At least 32 of the 59 victims of the blasts were at the government civil hospital.