Srinagar, India. Gunmen shot dead at least 20 tourists at a resort in Indian-controlled Kashmir, police said Tuesday, in what appeared to be a major shift in the regional conflict in which tourists have largely been spared.

Police described the incident as a “terror attack” and blamed militants fighting against Indian rule. “This attack is much larger than anything we’ve seen directed at civilians in recent years,” Omar Abdullah, the region’s top elected official, wrote on social media.

Two senior police officers said at least four gunmen, whom they described as militants, fired at dozens of tourists from close range. The officers said at least three dozen others were injured, many in serious condition.

Most of the tourists killed were Indian, the officers said, speaking on condition of anonymity in keeping with departmental policy. Officials collected at least 20 bodies in Baisaran meadow, some five kilometers (3 miles) from the disputed region’s resort town of Pahalgam.

There was no immediate claim of responsibility. Police and soldiers were searching for the attackers.

“We will come down heavily on the perpetrators with the harshest consequences,” India’s home minister, Amit Shah, wrote on social media. He arrived in Srinagar, the main city in Indian-controlled Kashmir, and convened a meeting with top security officials. He said Prime Minister Narendra Modi, on an official visit to Saudi Arabia, has been briefed.

Mirwaiz Umar Farooq, a key resistance politician and Kashmir’s top religious cleric, condemned what he described as a “cowardly attack on tourists," writing on social media that “such violence is unacceptable and against the ethos of Kashmir, which welcomes visitors with love and warmth."

The gunfire coincided with the visit to India of US Vice President JD Vance, who called it a “devastating terrorist attack.” He added on social media: “Over the past few days, we have been overcome with the beauty of this country and its people. Our thoughts and prayers are with them as they mourn this horrific attack."

US President Donald Trump on social media noted “deeply disturbing news out of Kashmir. The United States stands strong with India against terrorism.”

The meadow in Pahalgam is a popular destination, surrounded by snow-capped mountains and dotted with pine forests. It is visited by hundreds of tourists every day, as Kashmir, known for its Himalayan foothills and exquisitely decorated houseboats, has become a major domestic tourist destination.

It has drawn millions of visitors who enjoy a strange peace kept by ubiquitous security checkpoints, armored vehicles and patrolling soldiers.

Nuclear-armed rivals India and Pakistan each administer part of Kashmir, but both claim the territory in its entirety.

Kashmir has seen a spate of targeted killings of Hindus, including immigrant workers from Indian states, after New Delhi ended the region’s semi-autonomy in 2019 and drastically curbed dissent, civil liberties and media freedoms.

Tensions have been simmering as India has intensified its counterinsurgency operations. But despite tourists flocking to Kashmir in huge numbers, they have not been targeted.

Militants in the Indian-controlled portion of Kashmir have been fighting New Delhi’s rule since 1989. Many Muslim Kashmiris support the rebels’ goal of uniting the territory, either under Pakistani rule or as an independent country.

India insists the Kashmir militancy is Pakistan-sponsored terrorism. Pakistan denies the charge, and many Kashmiris consider it a legitimate freedom struggle. Tens of thousands of civilians, rebels and government forces have been killed in the conflict.

Violence has ebbed in recent times in the Kashmir Valley, the heart of anti-India rebellion. Fighting between government forces and rebels has largely shifted to remote areas of Jammu region, including Rajouri, Poonch and Kathua, where Indian troops have faced deadly attacks.