At election rallies before he became prime minister in May, the Hindu nationalist leader repeatedly called for tighter border controls and warned illegal immigrants from Bangladesh to have their "bags packed".

The calls prompted a strong reaction from Bangladesh, and its feathers are likely to be ruffled again by his latest comments to a party rally in Assam, where religious tension has been growing after massacres of Muslims in the past two years.

"I will make such an arrangement that all the roads that are today helping Bangladeshis enter and destroy Assam are closed," Modi said at the event organised by his Bharatiya Janata Party, which is looking to make inroads into the state.

"To ensure this, even a transfer of land will be used."

“I know Assam’s problems. I assure you all that there will be no compromise on Assam’s security. Land swapping will be done for a permanent solution,” he said.

India and Bangladesh have been negotiating a land swap for years to resolve a long-running border conflict. Modi said a swap would help Assam permanently resolve the immigration issue that has dominated its political landscape for decades.

"On the issue of land transfer, I know and understand the sentiments of the people of Assam," Modi added. "Whatever we do, there might be a perception of a short-term loss, but ultimately Assam will gain in the long run."

The government will close all roads to the forces, who are destroying the state “on a daily basis” and the law will take its own course to punish them, he said, adding, everything will be done for development and job generation in the North East.

He said BJP has for the first time fought elections on the single issue of development and forced other parties to consider this issue prominently.

“BJP government has only one motto and it is development. No party had the courage to fight elections on the development issue. In Maharashtra, Haryana and now in Jharkhand, all parties are talking about development,” he said.

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