As Hong Kongers March on 16th Anniversary of Return to China, China's Weibos Censor Searches About the March

On June 30, 2013, the state-sponsored Global Times published an article entitled "No Hidden Agenda in HK Pop Concert." Some excerpts:

Monday marks the 16th anniversary of the return of Hong Kong, as well as the day when Hongkongers hold an annual march to express their political demands for democracy.
People's rights to participate in marches and express their political demands are enshrined in law, and the government has never intervened in the July 1 marches.
. . . .
Intervention from the central government cannot be found either at the Hong Kong Dome Festival or the July 1 march. 

These screenshots show that on July 1, Sina Weibo began censoring searches for "Hong Kong 7 1 Take to the Streets." (香港 七一 上街)

This screenshot, also taken on July 1, shows that Tencent Weibo was censoring searches for "Hong Kong Take to the Streets." (香港 上街)