DUBAI, United Arab Emirates (AP) — Iranian President Ebrahim Raisi and the country’s foreign minister were found dead Monday hours after their helicopter crashed in fog, leaving the Islamic Republic without two key leaders as extraordinary tensions grip the wider Middle East.

Supreme Leader Ayatollah Ali Khamenei, who has the final say in the Shiite theocracy, quickly named a little-known vice president as caretaker and insisted the government was in control, but the deaths marked yet another blow to a country beset by pressures at home and abroad.

Iran has offered no cause for the crash nor suggested sabotage brought down the helicopter, which fell in mountainous terrain in a sudden, intense fog.

In Tehran, Iran’s capital, businesses were open and children attended school Monday. However, there was a noticeable presence of both uniformed and plainclothes security forces.

Later in the day, hundreds of mourners crowded into downtown Vali-e-Asr square holding posters of Raisi and waving Palestinian flags. Some men clutched prayer beads and were visibly crying. Women wearing black chadors gathered together holding photos of the dead leader.

“We were shocked that we lost such a character, a character that made Iran proud, and humiliated the enemies,” said Mohammad Beheshti, 36.

The crash comes as the Israel-Hamas war roils the region. Iran-backed Hamas led the attack that started the conflict, and Hezbollah, also supported by Tehran, has fired rockets at Israel.

Last month, Iran launched its own unprecedented drone-and-missile attack on Israel.

A hard-liner who formerly led the country’s judiciary, Raisi, 63, was viewed as a protege of Khamenei. During his tenure, relations continued to deteriorate with the West as Iran enriched uranium closer than ever to weapons-grade levels and supplied bomb-carrying drones to Russia for its war in Ukraine.

His government has also faced years of mass protests over the ailing economy and women’s rights.

The crash killed all eight people aboard a Bell 212 helicopter that Iran purchased in the early 2000s, according to the state-run IRNA news agency. Among the dead were Iranian Foreign Minister Hossein Amirabdollahian, the governor of Iran’s East Azerbaijan province, a senior cleric from Tabriz, a Revolutionary Guard official and three crew members, IRNA said.