The report published last week claims technicians at AU headquarters in the Ethiopian capital discovered last year that the contents of their computers had been regularly copied to servers in Shanghai since 2012, citing several unnamed AU sources.
"I think the report is a sensational story, but is also preposterous and absurd," Chinese envoy Kuang Weilin said on the sidelines of the AU summit in Addis Ababa.
The twice-yearly meeting is taking place in a soaring conference hall built by the Chinese as a symbol of their friendship with Africa and inaugurated the same year the alleged spying began.
AU commission chairperson Moussa Faki Mahamat played down the allegations during a press conference after the summit's close, saying he had seen "no evidence of espionage in the building," a sentiment shared by at least one African leader.
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"There is nothing to be spied (on). I don't believe it," Ethiopian prime minister Hailemariam Desalegn told journalists.
Le Monde says the AU's servers were changed and its IT systems redone after the copying was found.
China is deeply invested in Africa, regularly offering low-interest loans and gifts to individual nations and doing USD 149.2 billion (120.3 billion euros) in trade with the continent in 2016.
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