Two office workers were also injured when the man, who was apparently owed money, detonated his explosives in the building in Urumqi, capital of the northwestern region, a police official told AFP.

The incident did not appear to be related to ethnic unrest in Xinjiang, a vast desert area that is home to more than eight million Uighur Muslims.

The suspect was believed to be Han Chinese, said the policewoman, who declined to be named.

"The suspect, surnamed Han, went to a company located in Hetan district, he carried a black bag with explosives and he claimed the company owed him 4,500 yuan (660 dollars)," the Urumqi police official said.

The two office workers were trying to negotiate a solution with the man when he threatened to set off the explosives, she said.

"When the two people tried to flee the office, the man set off the explosive and died at the scene, wounding the two people."

The Uighurs are Turkic-speaking Muslims who have chafed under Chinese rule and complained for decades of political and religious repression.

China has accused Uighur separatists of fomenting unrest in the region, particularly in the run-up to and during the Olympics last year, when a wave of violence hit the restive area.

This year marks 60 years since China's People's Liberation Army entered Xinjiang and implemented what it calls a "peaceful liberation" of the region, a move independence activists view as an invasion.

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Washington, April 29, 2009
At the height of the Cold War, a U.S. Army corps commander in Europe asked for information on his Soviet opposite, the commander of the corps facing him across the inter-German border. All the U.S. intelligence agencies, working with classified material, came up with very little. He then took his question to Chris Donnelly, who had a small Soviet military research institute at Sandhurst in the United Kingdom. That institute worked solely from open-source, i.e., unclassified, material. It sent the American general a stack of reports 6 inches high, with articles by his Soviet counterpart, articles about him, descriptions of exercises he had participated in and other valuable material.