Official sources in the Ministry of Home Affairs said Tehran has conveyed its willingness to assist Delhi Police in its probe after the role of four Iranian nationals surfaced in the bombing that took place barely 500 metres away from the high-security residence of Prime Minister Manmohan Singh.
Delhi Police has named Houshang Afshar as the main accused who had planted a bomb on the vehicle of Israeli diplomat Tal Yeshua on February 13 that left the diplomat injured.
The names of three more Iranian nationals -- Masoud Sedaghatzadeh, Saeid Moradi and Mohammad Kharzei -- have also surfaced during the investigations into the probe.
The sources said Iran has been requested through diplomatic channels for help in tracing Afshar besides other details of the three accused who are in the custody of Bangkok and Malaysia.
The Delhi police also wants to corroborate the statement of Syed Mohammed Ahmed Kazmi, an Urdu journalist, arrested for allegedly being a part of larger conspiracy in the bombing incident as the police claimed that he named some Iranian nationals as his handlers during the interrogation.
In a related development, Delhi Police has approached a local court here for issuance of Letters Rogatory to five nations, including Iran and Israel.
The sources said that besides these two countries, Letters Rogatory was being sent to Malaysia, Thailand and Georgia after the Union Home Ministry and Legals and Treaty Division of Ministry of External Affairs to be sent to these respective countries.
