Emergency medical needs in Iran are rising exponentially, and stocks of trauma kits and other gear could run low if the war persists, the head of the International Federation of Red Cross and Red Crescent Societies delegation there said on Thursday, Reuters reports.

More than 1,900 people have been killed since the US-Israeli airstrikes on Iran began on February 28, and more than 21,000 injured, according to the agency—the only humanitarian group working across the country. Other estimates are higher.

Maria Martinez told Reuters three of the agency's own workers had died on duty, including one during an airstrike on March 31 that hit a medical clinic in Zanjan province. She did not attribute blame for the killings.

"Our concern is really how the humanitarian needs are escalating so rapidly and (over) our ability to bring all the support into the country," Martinez said.

Martinez said there were no shortages of emergency stocks for now, but the situation would worsen if the fighting continued, especially as the price of supplies went up and their insufficient funding ran low.

“The needs are exponentially increasing. Resources are not unlimited," she said.

The aid group says it has 100,000 responders across Iran's 31 provinces as well as helicopters and rescue dogs, and provides first aid for those injured by airstrikes and support for the displaced.