Pakistan's top interior ministry official is likely to rush back to Islamabad where nine people died on Tuesday in fierce gunbattles at a pro-Taliban city mosque, officials said.
Pakistan Interior Ministry Secretary Syed Kamal Shah, who arrived in new Delhi on Tuesday for two days of talks, is likely to fly back to Islamabad "in view of the grave situation," an Indian foreign ministry source said.
It was unclear if Shah will leave New Delhi later on Tuesday for Islamabad where gunbattles between students from a mosque and troops left nine dead, including a soldier, a journalist and several students dead and 120 hurt earlier on Tuesday.
The bilateral talks on terrorism and drug trafficking were scheduled to end on Wednesday evening.
The New Delhi talks, part of a slow three-year-old peace process between the two nuclear-armed rivals, were attended by Indian home secretary Madhukar Gupta.
India and Pakistan agreed to form a joint anti-terror panel after a series of blasts on crowded commuter trains in the financial hub of Mumbai a year ago that killed 186 people.
India has often blamed bloody attacks on its soil on militant groups based in Pakistan, which vigorously denies the accusations.