Saharanpur, Oct. 21 -- The Central Bureau of Investigation (CBI) intensified its probe into the high-profile Ankita Bhandari murder case on Wednesday, serving a formal notice to actress Urmila Sanawar at her residence in Saharanpur to appear for a narco-analysis test.

The development follows an ongoing investigation into a viral audio clip linked to the high-profile murder case.

According to Sanawar, a CBI team arrived at her home on Wednesday after a preliminary four-hour questioning session held on October 18.

"The CBI questioned me on the 18th. Today, I received a call from a CBI officer asking if I was at home. Upon arriving at my residence, they served me a notice for a narco-analysis test and asked me to appear before them the da...