The Pakistani High Commission in New Delhi was stormed by protesters when separatist leader Syed Ali Shah Geelani reached the venue.
Shouting slogans like "Vande Mataram" and "Bharat Mata ki jai", the protestors were demonstrating against Geelani and other separatist leaders.
They were later led away and detained by the police.
Geelani has reached the High Commission to meet Pakistani High Commissioner Abdul Basit, a move that has led India to cancel the upcoming Foreign Secretary level talks in Islamabad.