"I am of the opinion that the matter needs to be further investigated. CBI is directed to further investigate the case and submit its report by January 16 next year," Additional Chief Metropolitan Magistrate (ACMM) Sanjiv Jain said.

The CBI had filed a report before the court on September 29, claiming that one Jasbir Singh had allegedly heard Tytler inciting a mob to kill Sikhs after the assassination of former Prime Minister Indira Gandhi but his whereabouts could not be located.

The agency said Singh could not be examined as he was currently settled in the US.

The court's direction came after the counsel for the witness submitted that Singh was willing to join the investigation.

The counsel also submitted Singh's present address in the US.

The case relates to an incident of November 1984 – in the aftermath of the assassination of then Prime Minister Indira Gandhi -- when a mob had set afire Gurdwara Pulbangash, killing three persons.