Jammu Kashmir Pahalgam Terror Attack News Highlights: As many as 537 Pakistani nationals, including nine diplomats and officials, left India in four days from the Attari-Wagah border border point since April 24 after the government announced the visa revocation. The deadline for the 12 categories of short-term visa holders of the neighbouring nation ended today. Meanwhile, Prime Minister Narendra Modi, in his latest Mann Ki Baat episode, expressed “deep agony” over the Pahalgam terror attack that killed 26 people, and reiterated that the perpetrators and conspirators "will be served with the harshest response". NIA takes over probe: The National Investigation Agency (NIA) has taken over the investigation of the Pahalgam attack from the J&K police, upon directions of the Union Home Ministry. From questioning eyewitnesses to combing entry-exit points, the NIA teams, which have been camping at the terror attack site since Wednesday, have intensified the search for evidence. Meanwhile, Pakistani military troops opened 'unprovoked fire' along the Line of Control (LoC) for the third straight night. Indian Army soldiers "responded effectively with appropriate small arms fire," officials said. India's plan of 'retaliation': India is now considering "retaliatory" military options, following a series of diplomatic moves against Pakistan in aftermath of the Pahalgam attack that killed 26 people. “There will be military retaliation and we are prepared. We are discussing the nature of the strike… We have the option of targeting the terrorists from within our territory," a top government source in the know told The Indian Express.