GLOBAL: The Central Bank of Qatar (CBQ)’s law firm has sent a letter to the US Treasury requesting it to open investigations into First Abu Dhabi Bank’s US subsidiary, claiming that the branch manipulated foreign exchange deals designed to hurt the Qatari riyal. Reuters reported, citing the letter, that the CBQ believes that National Bank of Abu Dhabi (NBAD) Americas was driving the riyal lower during illiquid periods, such as the Eid Adha holidays last year, “reinforcing the manufactured narrative....