Chinese police said Sunday they have arrested the man wanted over a blast at a tax office in the central province of Hunan which killed four people and injured 19 over a week ago.

Liu Zhuiheng, 51, was captured at 5:45 a.m. Sunday in Quanzhou County in south China's Guangxi Zhuang Autonomous Region, some 500 kilometers south to the Changsha City, where the blast happened, police in Changsha said.

The explosion went off on July 30 on the third floor of a district tax office in Changsha, Hunan's capital city.

Police have offered 100,000 yuan (about 14,800 U.S.dollars) to find Liu, who they believe fled after setting off the blast.

Police in Hunan and Guangxi launched a joint action and nabbed the man in a rented room in Quanzhou County.

Police said the suspect admitted he had committed the crime.