C157 Misunderstanding

"We're from the Feng City Public Security Bureau. They contacted us in Hengzhou and said that you might have something to do with the accident in Jinyang coal mine a few years ago, so they want you to come with us."

Jian Huan was confused when she heard this. "I don't understand what you are talking about."

The two policemen looked at each other and one of them said, "Three years ago