In the spring of 2018, bank regulators trained to spot discriminatory lending detected something alarming at Bank of America. The bank was offering fewer loans to minority homebuyers in Philadelphia than to white people in a way that troubled examiners from the Office of the Comptroller of the Currency, according to two people directly involved in the probe and internal documents reviewed by ProPublica and The Capitol Forum. The officials suspected the second-largest bank in the U.S. was “redlining,” or deliberately turning its back on minority homebuyers, the people said. But after complaints from Bank of America, the OCC’s investigation stalled by September 2018. The OCC, which is part of the U.S. Treasury Department, never sanctioned the bank. Since President Donald Trump took office, the OCC has quietly shelved at least six investigations of discrimination and redlining, according to internal agency documents and eight people familiar with the cases. Flagstar Bank, a leading lender in Michigan, wrongly charged Black homeowners more through a network of mortgage lending affiliates, OCC officials concluded in 2017. That same year, agency examiners found that Colorado Federal Bank, an online lender, was doing the same to female borrowers. Another inquiry by OCC officials concluded that Chicago-based MB Financial, a lender acquired by Fifth Third Bank last year, charged Latinos too much on mortgage loans. Cadence Bank, a lender in several Southern states, was turning away minority borrowers in Houston, according to an OCC investigation. Fulton Bank, a lender based in Pennsylvania, had been discriminating against minorities in parts of Richmond, Virginia, and its home state, regulators concluded.