Hanoi, Sept. 18 -- The State Bank of Vietnam set the daily reference exchange rate at 25,186 VND/USD on September 18, down 12 VND from the previous day. The move came right after the US Federal Reserve (Fed) announced its first interest rate cut of this year. With the current trading band of +/- 5%, the ceiling rate applicable for commercial banks during the day is 26,445 VND/USD, and the floor rate 23,927 VND/USD. At 8:23 am, the opening-hour rates at major commercial banks continued to decline. Vietcombank cut both rates by 12 VND from the September 17 morning session, listing the buying rate at 26,165 VND/USD and the selling rate at 26,445 VND/USD. Meanwhile, BIDV cut the buying rate by 17 VND to 26,178 VND/USD and the selling rate by ...