SRINAGAR, India (AP) 鈥 Tensions between arch rivals India and Pakistan were high on Thursday as New Delhi mounted a diplomatic offensive against Islamabad, blaming it for a deadly attack that killed 26 people, mostly tourists, in disputed Kashmir.

India accused Islamabad of supporting 鈥渃ross-border terrorism鈥 Wednesday night and imposed diplomatic measures, including downgrading diplomatic ties, suspending of a key water-sharing treaty and closing the main land border crossing with Pakistan.

Pakistan has denied the accusation and a previously unknown militant group calling itself Kashmir Resistance has claimed responsibility for the attack. Islamabad said it would respond to India鈥檚 actions on Thursday and convene its 好色tv Security Committee, which is composed of senior civil and military officials.

鈥淚ndia has taken irresponsible steps and leveled allegations,鈥 Pakistan鈥檚 Foreign Minister Ishaq Dar told local Dunya News TV channel. Dar said India鈥檚 steps had so far been 鈥渘on-kinetic,鈥 and added that 鈥渁ny kinetic step by India will see a tit-to-tat kinetic response鈥 from Pakistan.

Diplomatic ties between the two countries were already weak, particularly after New Delhi after in 2019.

India and Pakistan each administer a part of Kashmir, but both claim the territory in its entirety. The two sides have long accused each other of backing forces to destabilize one another, and New Delhi describes all militancy in Kashmir as Pakistan-backed terrorism. Pakistan denies this, and many Muslim Kashmiris consider the militants to be part of a home-grown freedom struggle.

India said a number of Pakistani diplomats were asked to leave New Delhi and Indian diplomats were recalled from Pakistan. Diplomatic missions in both countries will reduce their staff from 55 to 30 as of May 1, India鈥檚 foreign secretary, Vikram Misri, announced Wednesday night.

Misri also said the only functional land border crossing between the countries would be closed, adding that India was also suspending a landmark water-sharing treaty.

The Indus Water Treaty, brokered by the World Bank in 1960, allows for sharing the waters of a river system that is a lifeline for both countries, particularly for Pakistan鈥檚 agriculture. The treaty has survived two wars between the countries, in 1965 and 1971, and a major border skirmish in 1999.

On Thursday, Prime Minister Narendra Modi called for an all-party meeting with opposition parties to brief them on the government鈥檚 response to the attack.

Some fear New Delhi may India may move beyond diplomatic sanctions as the country's media and leaders from Modi鈥檚 Hindu nationalist ruling party call for military action.

Praveen Donthi, senior analyst with the International Crisis Group, said framing the Kashmir conflict as a security crisis of Pakistan鈥檚 creation, 鈥渨hich can be resolved only through harsh talk and actions,鈥 brings political dividends to Modi鈥檚 government but could also leave it with few options in times of crises.

鈥淭he immense public pressure on the Modi government to retaliate strongly and militarily is self-created,鈥 said Donthi. 鈥漇oon, there will be no options left unless New Delhi starts looking to address the roots of political unrest in Kashmir,鈥 Donthi said.

In 2019, when into a paramilitary convoy, killing 40 soldiers, India claimed to strike a militant training camp inside Pakistan. Pakistan responded with air raids, downed an Indian military aircraft and captured an Indian pilot who was later released.

Two years later, in 2021, the two countries renewed a previous ceasefire agreement along their border, which has largely held since despite attacks on Indian forces by insurgents in Kashmir.

The attack shocked residents of Kashmir, where militants fighting against Indian rule have rarely targeted tourists and have mainly mounted their attacks against Indian forces.

In Kashmir, locals shut down markets, businesses and schools on Wednesday in protest amidst worries that the attack would hurt the region鈥檚 tourism economy.

Funerals of several of those killed were also held across some Indian cities and people participated in candle-lit vigils at some places, including in Srinagar, the main city in Kashmir.

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