Pakistan says it has “reliable intelligence” India is planning a military attack this month, something India dismissed as “war hysteria”.
Foreign minister Shah Mehmood Qureshi made the comments on Sunday.
Already tense relations between the two deteriorated this year when Pakistan-based militants killed dozens of Indian troops in Indian-administered Kashmir.
India responded with air strikes on what it said was a militant training camp in Pakistani territory.
Soon afterwards, Pakistan shot down an Indian jet in Pakistan-administered Kashmir, and captured its pilot. He was handed back to India days later.
The aerial attacks in February across the Line of Control (LoC) dividing Indian and Pakistani territory in Kashmir were the first since a war in 1971.
Both nuclear-armed nations claim all of Muslim-majority Kashmir, but only control parts of it.
What has Pakistan said?
Tensions seemed to have eased after the clashes, but on Sunday the Pakistani foreign minister said his country had intelligence to suggest an imminent Indian attack.
“There are chances of another aggression against Pakistan and according to our information this action can take place between April 16 and 20,” Mr Qureshi told reporters.