Iran has accused the US and Isarel of carrying out a "war crime" after a Iranian aircraft, reportedly on a humanitarian mission to India, was damaged in a US strike on Mashhad Airport.

The Iranian Embassy in India released a statement by the the Islamic Republic's civilian aviation authority, saying: "The attack on an Iranian aircraft carrying medicines and medical equipment constitutes a war crime and a clear violation of international law."

On Monday, news agency ANI cited Iranian unnamed officials saying the plane in question was scheduled to fly to New Delhi on April 1 as part of India's ongoing mission to provide humanitarian aid to Iran.

Despite its proclaimed neutral stance in the US-Israel war with Iran, New Delhi has been sending aid supplies to the Middle Eastern nation citing long-standing humanitarian ties.

Iran "strongly condemned the Israeli–American attack on an Iranian civilian aircraft transporting medicines and medical equipment from several countries to Iran, which had landed at Mashhad Airport."

The statement said that targeting a civilian aircraft engaged in humanitarian aid missions was a "blatant violation" of international aviation laws and the Geneva Conventions.

The US has not confirmed or responded to allegations of air strikes on civilian planes at the Mashhad Airport. New Delhi is yet to comment on the matter.