Lal, who is also the complainant in the case, told Special CBI Judge O P Saini that he was given the charge of probing this case in January 2013, and there were three investigating officers (IO) who carried out the probe in the case.

"I was supervising this case. There were three IOs, ED's Deputy Director Rajeshwar Singh and ED's Assistant Directors Kamal Singh and Satyendra Singh," he said.

On being asked by special public prosecutor (SPP) Anand Grover as to what was his role in the investigation, Lal said his role was to see that the probe was being carried out as per the law.

He deposed before the court that he had gone through the FIR and charge sheets filed by CBI in 2G spectrum allocation case and had also read the statements recorded by the ED's Ios under the provision of the Prevention of Money Laundering Act (PMLA) and other relevant documents before filing complaint in the case.

Recording of Lal's statement remained inconclusive and would continue on November 19, the next date of hearing.

Besides Raja and Kanimozhi, DMK supremo M Karunanidhi's wife Dayalu Ammal, Swan Telecom promoters Shahid Usman Balwa and Vinod Goenka and 14 others, including nine companies, are facing trial in the case in which ED has named 30 persons as prosecution witnesses.

On October 31, the court had put on trial the 19 accused -- 10 individuals and nine companies -- under the provisions of PMLA after they had pleaded not guilty and said that they will face the trial for the charges against them.

The court had framed charges against the accused, saying that Raja allegedly in "connivance" with Kanimozhi, Dayalu Ammal and other co-accused was involved in "parking" of illegal gratification of Rs 200 crore in DMK-run Kalaignar TV.

If convicted, Raja and others will face a maximum sentence of up to seven years.

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