Sources in the Indian government have said "all options will be available" if the country is hit by another terrorist strike.
The sources told the news agency PTI that India will insist on "concrete steps" by Pakistan to dismantle terrorist infrastructure on its soil and that since Balakot, India has been "trying to build maximum pressure on Pakistan".
Pakistan has stopped an Indian submarine from entering its waters, the navy said Tuesday, as tensions continue to run high between the nuclear-armed foes.
The development came days after a rare aerial dogfight between India and Pakistan over the disputed territory of Kashmir ignited fears of an all-out conflict, with world powers rushing to urge restraint.
Foreign minister Jeremy Hunt said on Tuesday the European Union was giving "reasonably positive" signals about giving Britain changes to Prime Minister Theresa May's Brexit deal which could help it get parliamentary backing.