Later, the public security organs identified the case as a criminal case. After on-the-spot investigation, investigation and interview, video surveillance and retrieval, physical evidence inspection and DNA comparison, the public security organ determined that the explosion was caused by an explosive device made by Xu Moumou (male, 22 years old, from quanshan district, Xuzhou), who died on the spot.
It has been found out that after dropping out of school due to autonomic nerve dysfunction, Xu rented a house near the crime scene to work. In the rented house, it was found that homemade explosive device materials were left behind, and the words "dead", "dead" and "absolutely" were left on many walls. At this point, the public security organ announced that the case was solved.
Police, hurry!