The man suspected of causing multiple explosions in the Guangxi Zhuang autonomous region hired people to help deliver parcel bombs, the police said Thursday.

The explosions, which happened on Wednesday afternoon, killed at least seven people and injured 51 others in Dapu township, the seat of Liucheng county, and surrounding area. Two people are still missing.

According to the Liuzhou police, the suspect, 33-year-old Liucheng native Wei Yinyong, hired street vendors to deliver express mail packages containing explosives. The devices exploded when the parcels were opened.