"We are investigating about all the numbers from which such calls are being made and will take strict action against such callers," DCP (New Delhi) Jatin Narwal said today.
A police official said Yechury filed a police complaint mentioning all numbers through which the threats were received from callers who alleged that the Left leader has spoken "wrong" thing about Goddess Durga in Parliament.
Yechury had yesterday said that he received several threat calls and text messages.
"What they are saying is all non-sense as I did not say anything of that sort. There is not even one mention of Durga. My speech is on Youtube. This is a deliberate campaign against me," Yechury had said without naming anyone.
Yechury had earlier received similar threats on February 15 in connection with JNU row and a police complaint was lodged but none of the callers, who made the Internet generated calls, could be traced by the investigators.