I was walking into the bank when a person carrying a briefcase pushed past me and went to the toilets. I didn’t realize it’s significance until I was getting money out of the ATM. The same man went past me and soon after he left I realized that he had left his briefcase behind. I started to follow him but then the flash made me stop and blink my eyes a few times. Then I suddenly realized that the bomb was in the briefcase and that was why the man moved so quickly to get out of the bank.