New Delhi: Air India and IndiGo issued travel advisories on Thursday after Iran closed its airspace to commercial aircraft, triggering flight diversions, delays and cancellations as tensions intensified between Tehran and Washington amid a deadly crackdown on nationwide protests.

Air India took to X and said, “Due to the emerging situation in Iran, the subsequent closure of its airspace, and in view of the safety of our passengers, Air India flights overflying the region are now using an alternative routing, which may lead to delays.”

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“Some Air India flights where currently rerouting is not possible are being cancelled... Air India regrets the inconvenience caused to passengers due to this unforeseen disruption. Safety of our passengers and crew remain top priority,” it added.

IndiGo Airlines released a travel advisory warning of the impact on international flights, citing Iran's airspace closure.

“Due to the sudden airspace closure by Iran, some of our international flights are impacted. Our teams are working diligently to assess the situation and support affected customers by offering the best possible alternatives," the advisory said.

Iran further extended an order closing its airspace to commercial aircraft without explanation early Thursday as tensions remain high with the United States over Tehran’s bloody crackdown on nationwide protests.

A notice to pilot said the closure was estimated to last until 7:30 a.m. local time. A previous order had closed the airspace for just over two hours.

The Iranian government offered no explanation of the decision to shut its airspace.

The United States requested an emergency meeting of the U.N. Security Council on Iran on Thursday afternoon, a council diplomat said, speaking on condition of anonymity because the meeting has not yet been scheduled.

The security force crackdown on the demonstrations has killed at least 2,586, the U.S.-based Human Rights Activists News Agency reported. The death toll exceeds that of any other round of protest or unrest in Iran in decades and recalls the chaos surrounding the country’s 1979 Islamic Revolution.

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U.S. President Donald Trump said Wednesday that he’s been told “on good authority” that plans for executions in Iran have stopped, even as Tehran has signaled fast trials and executions ahead in its crackdown on protesters.

The U.S. president’s claims, which were made with few details, come as he’s told protesting Iranians in recent days that “help is on the way” and that his administration would “act accordingly” to respond to the Iranian government.

But Trump has not offered any details about how the U.S. might respond and it wasn’t clear if his comments Wednesday indicated he would hold off on action.

Earlier Wednesday, Gholamhossein Mohseni-Ejei, Iran’s judiciary chief, said the government must act quickly to punish more than 18,000 people who have been detained through rapid trials and executions.