A fire erupted at a wood workshop located within the grounds of a military barracks in the Iranian capital on Friday, the army said in a statement.
The blaze was contained and no injuries have been reported, the army added, as it blamed an electrical fault for the fire.
"The fire was brought under control when firefighting teams arrived on time," said the statement, which was carried by official media.
Earlier this week, a fire broke out at a bazaar west of Tehran, with rescuers bringing it under control.
The fire on Tuesday did not result in any injuries, rescuers had said at the time.
Fires and explosions in Iran have often provoked fears of possible attacks by Israel or the United States, after Israel attacked Iran in a 12-day air war in June which the United States briefly joined, pounding key nuclear installations and killing top military commanders and nuclear scientists.