C154 An enigmatic murderer

"In other words, this explosion is most likely a revenge." I muttered, "Did you report the results of the explosion?"

"The bomb is made of nitroglycerin. This thing is not easy to make. And to make such a bomb, we need to be very specialized in chemistry. " Zhao Youzhen said: "So the culprit must have a certain level of knowledge in chemistry."

"I've been in Tianjin for so many years