LONDON/NEW YORK (Reuters) – U.S. and British regulators fined Deutsche Bank (DBKGn.DE) $2.5 billion (1.67 billion pounds) and its British subsidiary pleaded guilty to criminal wire fraud on Thursday as it became the eighth financial group to settle allegations of rigging interest rate benchmarks. The record penalty in a seven-year investigation that has shredded the banking industry’s reputation takes the total fines imposed on some of the world’s top financial institutions to more than $8.5 billion. U.S.