The possible cause is U.S. airstrikes which also struck a nearby Revolutionary Guard facility according to data of AP, satellite pictures, expert opinions.
Trump pointed out that the US military operations against Iran might last weeks, reminiscent of the words Russian President Vladimir Putin had said when Moscow launched an attack on Ukraine more than four years ago.
Hezbollah joins conflict, prompting Israeli strikes on Lebanon, and first 3 U.S. casualties confirmed, while Iran faces leadership vacuum after Khamenei's death.
Several countries in the Middle East, including the United Arab Emirates, Qatar, Kuwait, Jordan, Iraq, Iran, and Israel, have closed their airspace due to the ongoing tension.
Targets included military sites in Tehran, areas near Supreme Leader Ayatollah Ali Khamenei's offices and the presidential compound, Isfahan, Qom, Karaj and Kermanshah.
The festival, which began over 2,000 years ago, features ancient spiritual traditions and celebrates family reunions while socializing by going out onto the streets.