The move follows another blast Thursday morning (Oct 1) that struck a residential building near a government office in Liucheng country, in the region of Guangxi, the Southern Metropolis Daily said.
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The blasts targeted a bus station, a shopping mall, several government buildings, a hospital, and local markets, among other targets, according to police.
Pictures showed one six-storey building gutted and collapsed, and streets littered with glass, bricks and other debris.
The Public Security Ministry said it was treating the blasts on Wednesday as a criminal act, and not terrorism.
The local public security office said in a statement on the Weibo Web blog site the suspect surnamed “Wei” had committed the crime by hiring couriers to deliver his bomb packages.
Police have arrested a suspect they believe sent out the bombs in the mail.
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.
Seventeen separate explosions hit Liucheng on Wednesday.
They have since issued a statement calling on Liucheng residents not to accept packages from strangers or “non-proper channels”.
In April 2014, authorities in the northern city of Taiyuan executed a man after finding him guilty of setting off several deadly blasts near a provincial ruling Chinese Communist Party headquarters in November 2013 that killed at least one person.
The blasts might have exposed “loopholes of management of the express delivery industry”, said Dai, who also suggested that the blasts might point to the need for real-name registration of both package senders and receivers.
Disgruntled Chinese citizens have in the past bombed local government offices and public places to try to draw attention to their grievances.
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In 2011, a man apparently angry about the illegal demolition of his home set off coordinated explosions at three sites near government buildings in eastern China, killing two people.
