Bangladesh, May 8 -- The Bharatiya Janata Party's (BJP) landslide victory in West Bengal has turned old campaign rhetoric into a fresh border concern for Bangladesh.

Meanwhile, Bangladesh has tightened vigilance along parts of its border with India after the BJP's landslide victory in West Bengal revived concerns over possible "push-ins" of people into Bangladeshi territory.

When India's BJP swept to a historic landslide in West Bengal last week winning more than two-thirds of the state assembly seats, its first such majority there it did so on a campaign that had repeatedly threatened to brand the state's Muslim residents as illegal immigrants and force them across the border into Bangladesh.

Now, with the BJP firmly in power along 2,...