The Congress on Thursday hit back at Prime Minister Narendra Modi on his charge that banks were forced to give loans to select industrialists during UPA rule, saying bad loans increased in his regime.The Congress also demanded a probe by independent agencies into the issue."Yesterday (Wednesday) Modiji said that NPA is the biggest scam. We agree with it but we want to know who gave birth to it," Congress spokesperson Randeep Singh Surjewala told reporters here.Attacking the Modi government, Surjewala said: "When the Congress lost power in 2014, as per the Reserve Bank of India (RBI), gross NPA of public sector banks in 2013-14 was Rs 2,27,264 crore."And as per PIB (Press Information Bureau) press release dated October 24, 2017, this has increased in June 2017 to Rs 7,33,137 crore," he said. "The NPA in 42 months of Modi government increased by Rs 5,05,873 crore."He said the gross NPAs of scheduled commercial banks in 2013-14 was Rs 2,63,372 crore. "And as per the rating agency CARE, gross NPAs of scheduled commercial banks has increased to Rs 8,29,338 crore. Thus, in 42 months of Modi government, it has increased by 5,65,966 crore," he said.Surjewala also said that under Modi government, a total of Rs 1,88,287 crore loans of the industrialists were waived off. "In 2014-15, the NDA government waived loans of Rs 49,018 crore, in 2015-16 it waived off Rs 57,586 crore of loans and in 2016-17 it waived off Rs 81,683 crore loans of industrialists," he said."If he described NPA as the biggest scam, he should then answer why is such a big scam happening under his nose?" the Congress leader asked."The Prime Minister must also tell as to why has his government waived loans of wilful defaulters worth Rs 1,88,287 crore in the last three years?"He dared the government to order a probe by independent agencies into the same.On Wednesday, Modi attacked his predecessor Manmohan Singh and the UPA government, saying some of its "people" had forced banks to lend to some industrialists, which he described as the "biggest scam", bigger than the 2G, coal and Commonwealth Games scams.