Twenty Indian pilgrims were heading to the city of Qom, considered holy in Shia Islam, last night when the accident.
"I have got the report from Indian Embassy in Tehran. A bus carrying 20 Indian pilgrims on way to Qom met with an accident last night. Unfortunately, we lost Ms. Kulsum Fatima aged 14 years because of head injuries," Swaraj tweeted.
Another national named Mohammad Ali is in the ICU, while 18 Indians were discharged after first aid, she said.
"Our mission staff is in the hospital to provide any assistance," Swaraj said.
The city is a significant destination of pilgrimage.
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