HONG KONG (REUTERS).- A spate of graffiti appearing across Hong Kong in recent weeks in support of detained Chinese artist Ai Weiwei has sparked a warning by the Chinese army garrison in the city, a newspaper reported on Saturday. An artist in the former British colony calling himself Cpak Ming recently projected an image bearing the words “Who’s Afraid of Ai Weiwei?” onto a wall at the People’s Liberation Army (PLA) harbor-front barracks in the heart of the city. While the brief artistic stunt with a camera, that was photographed and uploaded onto Facebook, left no physical trace, a PLA spokesman in Hong Kong said such acts breached Hong Kong laws and the PLA would “reserve its legal rights” to act, the South China Morning Post reported. “No one can paint or project pictures and images onto the outer wall of the barracks with the garrison’s permission. Such an offence is a breach of Hong Kong law. The PLA reserve its legal rights,” the PLA spokesman was quoted as saying. Ai, a