A Delhi court has granted permission to the National Investigation Agency (NIA) to collect voice and handwriting samples of Tahawwur Hussain Rana, a key accused in the 26/11 Mumbai terror attacks, according to a source.

The order was passed on April 30 by Special NIA Judge Chander Jit Singh, following an application filed by the agency. Earlier, on April 28, the court had extended Rana's custody by 12 days.

Rana, a close aide of David Coleman Headley (alias Daood Gilani)—one of the main conspirators of the 2008 attacks—was recently extradited to India after the U.S. Supreme Court rejected his final legal challenge against extradition on April 4.

The 26/11 Mumbai attacks, carried out by 10 Pakistani terrorists, targeted several high-profile locations including the Chhatrapati Shivaji railway station, Taj Mahal Palace Hotel, Oberoi Trident, and a Jewish centre. The coordinated assault, which lasted nearly 60 hours, claimed the lives of 166 people.