At least 19 people were killed in an explosion in a clinic in the Iranian capital Tehran, officials say.
Several people were injured in the Sina Athar clinic and it is feared that the death toll will rise further.
Iranian state media quoted senior officials as saying the explosion was caused by a gas leak.
The television images showed plumes of smoke floating in the sky. The firefighters put out the fire a few hours later.
Most of the victims of Tuesday’s explosion were women, according to authorities.
Some of the victims “were on the upper floors, in the operating rooms – who were either operated patients or those with them,” said Tehran firefighter spokesman Jalal Maleki, according to the Iranian news agency Isna.
“Unfortunately, they lost their lives because of the heat and thick smoke,” he said.
The accident came several days after a major explosion near a military facility rocked Tehran.
The authorities also claimed that the cause of the accident was a gas leak.