"They will always be remembered as friends of India who contributed immensely to the growth of the India-Iran relationship. The Government of India stands in solidarity with the people of Iran at this very difficult time," Jaishankar said in a post on X after visiting the Iranian Embassy.
Raisi and Abdollahian were among nine people who died after their helicopter crashed in Iran's mountainous north-west area while they were returning from the Azerbaijan border after flagging off joint projects in the region.
The National Flag is being flown at half-mast on all buildings in India on Tuesday and no official entertainment has been scheduled for the day.