Indian forces remain on a "heightened" state of alert despite Pakistan's promise to free a pilot shot down in air raids this week, top Indian military chiefs said Thursday.

Top generals from the Indian air force, army and navy also renewed claims that India had shot down a Pakistani F-16 jet in the air battles after an attack Wednesday on military installations in Indian-administered Kashmir.

"We are fully prepared and in a heightened state of readiness to respond to any provocation from Pakistan," said the army's Major General Surendra Singh Mahal at a press conference.