India has closed its main border crossing with Pakistan, expelled its military diplomats and suspended a landmark water-sharing treaty following an attack that killed 26 people in Indian-administered Kashmir.
Pakistan has denied involvement in the attack and will convene a national security meeting on Thursday to discuss a response to the measures taken by India.
Gunmen burst out of forests and opened fire on visitors with automatic weapons in the attack near the picturesque tourist town of Pahalgam.
Prime Minister Narendra Modi cut short a foreign trip to return to Delhi to meet security chiefs. He's pledged those responsible will not be spared.
"Those behind this heinous act will be brought to justice... They will not be spared! Their evil agenda will never succeed. Our resolve to fight terrorism is unshakeable and it will get even stronger," he posted on X.
More funerals are being held today for those who were killed. The victims include a honeymooning groom and a businessman on holiday
There's been no official confirmation yet on who carried out the brutal attack but some media reports say a group linked to Pakistan-based organisation Lashkar-e-Taiba may have claimed responsibility.
Kashmir, which is claimed by both India and Pakistan in its entirety, has been a flashpoint for decades. Indian-administered Kashmir has seen a decades-long insurgency which has claimed thousands of lives - but attacks on tourists have been rare.
Speaking at an event in Bihar, PM Modi said: "Our enemies have dared to attack the country's soul. I want to say this clearly: the terrorists behind the killings, along with their backers, will get a punishment bigger than they can imagine."
"Today, from the soil of Bihar, I say to the whole world [that] India will identify, track and punish every terrorist and their backers. We will pursue them to the ends of the Earth. India's spirit will never be broken by terrorism," Modi said, adding that the entire country is "firm in this resolve".
"Everyone who believes in humanity is with us. I thank the people of various countries and their leaders who have stood with us in these times," he added.
Meanwhile, the BBC is reporting that Kashmiri students in parts of India are facing harassment in the aftermath of Tuesday's killings.
Jammu and Kashmir Chief Minister Omar Abdullah said his government was in touch with officials from some of the states where students were allegedly threatened or assaulted - but did not give further details.
A spokesperson for Abdullah's National Conference party said several videos showing students being harassed in colleges and other places were being circulated online.
Abdullah's key opponent and former chief minister Mehbooba Mufti said she had spoken to Home Minister Amit Shah, urging him "to ensure the safety and protection wherever such incidents are being reported".
Nasir Khuehami, head of the Jammu and Kashmir Students Association, shared a video of a right-wing Hindu group threatening to physically assault Kashmiri Muslim students in the northern state of Uttarakhand to ensure they leave.
“The situation is turning grim and deeply concerning. We have received frantic distress calls from Kashmiri students from Arni University, Kathghar (Indora), in Kangra in Himachal Pradesh, who are being harassed, abused and physically attacked by right-wing and fringe elements," Khuehami wrote on X.
Pakistani nationals in India have started arriving at the Attari-Wagah border between the countries after Delhi cancelled a visa exemption scheme that had allowed them to stay here.
Those who are currently in India have been given 48 hours to leave the country, the Indian government announced yesterday.
Meanwhile, Indian citizens who are in Pakistan with valid endorsements have been told to return through the route before 1 May.
Mansoor, a Pakistani national, who came to Delhi to visit his relatives said the move had left him upset.
"Whatever happened [in Pahalgam] should not have happened," he told PTI news agency. "However, the government should not have done this [suspended the visa scheme]."
Shaitan Singh, an Indian citizen from the western state of Rajasthan, was scheduled to cross the Attari border to enter Pakistan for his wedding today - but he is now unsure of what he can do.
"The border is closed... Let us see what will happen now," he said.