Delhi Police had sent a two-member team to Iran last year

and the passport details and other evidence alleging the role of its nationals in the bombing were handed over to authorities there. New Delhi also handed over the probe report by Malaysian authorities, according to which Afshar, after fleeing from India on February 13 last year had taken a connecting flight to Tehran from Kaula Lumpur airport on the next day, sources said. India has secured an Interpol Red Corner warrant against all the four and it was also issued. The phone book of Masoud Sedaghatzadeh, who was arrested by Malaysian police from Kuala Lumpur airport, led to the arrest of Kazmi. A Letters Rogatory has been sent to authorities in Thailand for sharing the interrogation reports of two Iranian nationals -- Saeid Moradi and Mohammad Kharzei (both part of botched up plan in Bangkok) -- as one of them was part of the Indian operations as well and had visited New Delhi last year, the sources said. The explosive used for the bombing here was TNT -- Trinitrotoluene--the Central Forensic Sciences (CFSL) had said in its report two months after the attack. According to the sources, evidence collected so far which includes a statement of Kazmi to Delhi Police and a plan that a spate of attacks were planned in New Delhi, Bangkok and Georgia was to take revenge for attacks on Iranian scientists since 2009. Four Iranian nuclear scientists have been killed in attacks since 2009.