The Istanbul stock exchange on Monday briefly suspended trading after its main index fell by more than six percent in response to President Recep Tayyip Erdogan's dismissal of his market-friendly central bank chief. The Borsa Istanbul said its automatic circuit breakers were triggered at 9:55 am (0655 GMT). Trading resumed at 10:30 am but could be halted again should the slide continue. zak/raz/bmm