Patna/, July 19 -- Prime Minister Narendra Modi on Friday tore into the Opposition in two separate rallies, accusing the Rashtriya Janata Dal and Congress of blocking Bihar's progress and alleging that the Trinamool Congress risked West Bengal's identity and national security by promoting infiltration for votebank politics. Modi addressed a rally in Motihari in Bihar after laying the foundation stone and inaugurating multiple development projects worth Rs.7,200 crore. Later in the day, he spoke at Durgapur in West Bengal after inaugurating projects worth Rs.5,400 crore. In Bihar, Modi said his government's top priority was to remove backwardness - whether of the region or the people - and therefore Bihar was poised for fast-paced development. "We neither get trapped in slogans nor remain confined to promises, we believe in concrete action which is reflected through our policies and programmes. When I say we work about backward classes and extremely backward classes, we mean it and work for their uplift. The NDA government's mission is that priority for every backward, whether it be a backward area or class," he said, adding Bihar had moved out of the lantern age - a reference to the RJD's poll symbol - to a new Bihar of hope. Bihar is set to go to the polls later this year. "We see like Mumbai in the west, Motihari growing in east, Gayaji like Gurugram, Patna like Pune... we have to make Bihar a developed state and work is happening at great speed as both Centre and the state have governments, which believe in working," he said. In Durgapur, Modi positioned the Bharatiya Janata Party as the only one that respects and protects Bengali "ashmita" (identity), calling for an end to what he termed a regime of "lies, lawlessness and loot. "TMC, because of its vested interests, has put the identity of West Bengal at stake. For the sake of votebank politics, infiltration is being encouraged here. A complete ecosystem has been created to support infiltrators. This is a threat to both national security and Bengal's security and identity," Modi said, accusing the ruling party of "openly challenging constitutional institutions" and "defending illegal immigrants." His comments came amid a simmering row over Bengali-speaking migrant workers alleging harassment in BJP-ruled states. In Bihar, Modi inaugurated four Amrit Bharat trains and infrastructure projects, including the four-lane Parariya to Mohania section of NH-319, worth over Rs.820 crore, New Software Technology Parks of India facility at Darbhanga and fisheries development projects sanctioned under Pradhan Mantri Matsya Sampada Yojana (PMMSY). He also handed over the keys of houses to 12,000 beneficiaries as part of the Griha Pravesh ceremony, and released funds for housing schemes....