New Delhi, March 25 -- Delhi Police informed a city court on Monday that further investigation is needed in the extortion and attempted murder case involving former Research and Analysis Wing (R&AW) officer Vikash Yadav. Investigators have accessed new call detail records (CDRs) relevant to the case, which are yet to be analysed.

Yadav is also a key accused in a separate international assassination plot, with the United States alleging he orchestrated a failed attempt to kill Sikh separatist leader Gurpatwant Singh Pannun. Another accused in that case, Nikhil Gupta, is in US custody.

During a February hearing, additional sessions judge Sumit Dass of Patiala house courts summoned the investigating officer for an update after a prior abse...