“At three or four in the morning, something happened in a train carriage—someone recalled hearing a loud sound. After the crew investigated it, they said that someone had secretly smuggled firecrackers in. Everyone in that train carriage was evacuated and a few have been detained.”
The leader of the team suddenly revealed this information to her.
When travelers board the train, they would have to undergo a strict security check by the authorities before that. It was impossible for anyone to smuggle prohibited items on board.