The United States said on Sunday it was trying to find out if Pakistan used U.S.-built F-16 jets to down an Indian warplane, potentially in violation of U.S. agreements, as the stand-off between the nuclear-armed Asian neighbors appeared to be easing.

Pakistan and India both carried out aerial bombing missions this week, including a clash on Wednesday that saw an Indian pilot shot down over the disputed region of Kashmir in an incident that alarmed global powers and sparked fears of a war.

A Pakistan military spokesman on Wednesday denied Indian claims that Pakistan used F-16 jets.

Pakistan returned the captured Indian pilot on Friday in a high-profile handover Islamabad touted as a “peace gesture”, which appeared to significantly dial down tensions, but both sides remain on high alert.

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