NEW DELHI — India’s top domestic security official on Sunday called on the Pakistani government to investigate Indian claims that “elements based in Pakistan” had orchestrated a fear-mongering misinformation campaign using text messages and social media that helped set off last week’s nationwide panic among migrants from India’s isolated northeastern states.

Home Minister Sushil Kumar Shinde, speaking by telephone with his Pakistani counterpart, Rehman Malik, asked for “full cooperation” in “checking and neutralizing such elements,” according to a Home Ministry statement. His telephone call came a day after a senior ministry official said that doctored images of dead bodies had been sent to thousands of northeastern migrants living in several of India’s major urban centers.

“We want people to know that the bulk of this was done from Pakistan,” Home Secretary R. K. Singh told reporters in New Delhi on Saturday night. He added, “A total of 76 Web sites were identified where morphed images were uploaded, and the bulk of these were uploaded in Pakistan.”

The Indian news agency, IANS, quoted an anonymous Pakistani official denying any involvement. Describing India’s claims as “cooked up,” the official told IANS that “instead of indulging in mudslinging and the blame game, it’s time for India to address its internal issues.”