The man suspected of detonating an explosive device in Beijing Capital International Airport on Saturday evening has been detained, the municipal public security bureau said.
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The device exploded outside Gate B at the Terminal 3 arrival hall.
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Ji Zhongxing, 34, from Heze city, Shandong province, allegedly set off a homemade bomb, which police said was produced from powder used in fireworks. The explosion injured the suspect's left arm and injured a policeman.
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Beijing police said Ji is under investigation and they are looking at how he came to the airport, if others were involved in the incident and why it occurred.
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Airport police said they have boosted security checks, and dispatched more police officers on patrol in around departure and arrival halls.
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The suspect worked in Guangdong and has been petitioning for more than 10 years over what caused his paralysis in 2005, according to the police.
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The government in Dongguan city, Guangdong province, has established a special team to investigate.Â