"It was a unique investigation in which 657 witnesses were examined and investigating agencies from all over the world were involved," he said, reacting to the Supreme Court ruling upholding the death sentence for Kasab.
The investigation was challenging, Maria said, as the conspiracy had been hatched on the foreign soil and the terrorists were well-equipped. The ATS was still hunting for the remaining accused, most of whom were in Pakistan, he said.
He thanked various departments of Mumbai police, forensic department and special public prosecutor Ujjwal Nikam for their efforts.
Referring to the probe of low-intensity blasts in Pune on August 1, Maria said ATS would try to get a break-through in the case before the Ganesh festival as directed by the state government. The investigation in the J M Road blast was making a good progress, he added.