The racket was busted on July 30 with the arrest of four persons. The police is now looking for the kingpin's main associate, who was involved in a similar scam around four years ago.
The accused were found to be involved in around 25 fake documents-based admissions in leading DU colleges that include Hindu College, Kirori Mal College, Aurobindo College (evening), Dayal Singh College (morning and evening), Shaheed Bhagat Singh College, Kamla Nehru College and Ram Lal Anand college.
As many as 10 admissions were secured in Shaheed Bhagat Singh college alone, said a senior official. The police are now looking for Kaku's neighbour-cum-associate Himanshu Gupta (30), who was once arrested in connection with another DU admission scam in 2011.
"Kaku claimed to be the secretary of the youth wing of a national political party and it has also emerged that he was planning to contest in the upcoming 2017 municipal election in Delhi," an official privy to the investigation told PTI.
Kaku told the police that he and Gupta fled together on July 29 and lived at several places-- mostly at friends' and relatives' houses in Uttar Pradesh and Uttarakhand.
But Gupta separated and went his own way around 12 days ago. Kaku has so far claimed to have no idea about Gupta's whereabouts, said the official.