Zakiur Rehman Lakhvi , the main accused in the Mumbai attacks , has refused to provide voice samples to India in the case. Lakhvi's lawyer, Rizwan Abbasi said, “According to our law, consent was necessary for a voice sample.”

He said, “My client has refused in the past and will refuse again.”

Recently, Indian Prime Minister Narendra Modi and PM Nawaz Sharif released a joint statement, vowing to accelerate proceedings of the Mumbai attack case among other sticking points.

Lakhvi was accused of plotting a 2008 militant assault on India's financial capital Mumbai that killed 166 people. Lakhvi was released from Adiala Jail in April this year, after a court ordered dismissal of detention orders issued against him.