Artist Guo Jian detained by Chinese army . Detention comes after publication of poem in which artist criticized Chinese army . Guo was a protester at the 1989 Tiananmen crackdown . Latest is a commemoration of events in which hundreds of protesters were killed .
Artist Guo Jian detained by Chinese authorities . Detention comes after publication of article in which artist criticized Chinese army . Guo was a protester at the 1989 Tiananmen crackdown . Latest artwork a commemoration of events in which hundreds of protesters were killed .