In a communication, the home ministry asked the Border Security Force (BSF), deployed along the 4,096-km Indo-Bangladesh border, and the Assam Rifles, which guards the 1,643-km Indo-Myanmar border, to intensify vigil.
The two border guarding forces were asked to remain extra vigilant so that no illegal immigrant could enter India, the home ministry official said.
The move came after the government told the Supreme Court that Rohingyas were "illegal" immigrants and some of them were part of a "sinister" design of Pakistan's ISI and terror groups such as the ISIS, whose presence in the country will pose a "serious" national security threat.
Rohingyas are minority Muslims in western Myanmar and have been fleeing their homes following a crackdown on their villages that has left hundreds dead.
Hundreds of thousands of Rohingya Muslims, described by the UN as the most persecuted minority in the world, fled their homes in Rakhine state recently to escape a military crackdown. It seemed a "textbook example of ethnic cleansing", UN human rights chief Zeid Ra'ad Al Hussein had said.
Get the latest election news, live updates and election schedule for Lok Sabha Elections 2019 on ndtv.com/elections. Like us on Facebook or follow us on Twitter and Instagram for updates from each of the 543 parliamentary seats for the 2019 Indian general elections.