JINAN - The family of a man who detonated an explosive device at a Beijing airport said they did not know of the bomber's plans beforehand, according to a statement from the police department of Heze City, the bomber's hometown.

Ji Zhongxing, 34, set off a home-made explosive device outside the Terminal 3 arrivals hall of the Beijing Capital International Airport on Saturday evening. Ji sustained injuries to his arm and is currently receiving treatment.

The explosion caused no other injuries.

Ji's father said he saw his son at home on Friday night but could not find him the next morning. The father called Ji, who did not tell his father his whereabouts.

Ji once worked in the southern province of Guangdong. For ten years, he has been petitioning about alleged unjust treatment that resulted in his paralysis, according to a police investigation.

The police cordon at the arrivals hall has been removed, and normal order has been restored at the airport.