The petition calls for the immediate release of activist Yang Zhanqing, detained last month for 'running an illegal business.'
The march comes days after the city's legislature rejects a Beijing-backed electoral reform package dismissed by campaigners as 'fake democracy.'
Beijing says the ruling Chinese Communist Party faces internal “threats” to its power.
The defense lawyers in both cases have dismissed the charges as exaggerated and ridiculous.
Some people are taken to the hospital after “feeling unwell,” as local officials promise a full investigation.
Wong's girlfriend says she won't tone down her activism in response to the attack, however.
The real number of detained online writers could be far higher than those whose cases have been revealed publicly.
Tens of thousands march as authorities impose a strict information blackout on local media.
The clashes come after the government moves to clear thousands of ancestral tombs from a nearby hillside, residents say.
Chai Huiqun's lawyer accuses the medical body of forging evidence to back up its case.
Liang Taiping had planned to attend a human rights forum on the prevention of torture in Thailand.
Beijing has scant interest in addressing US concerns ahead of a state visit by China's president.
Demobilized soldiers say they want the government to pay them their legal entitlement.
The authorities send in more riot police following clashes with thousands of residents.
Some say they will come back again, while others say they'll carry on the pro-democracy campaign elsewhere.
A dog-meat and lychee festival in the southwestern city is increasingly being targeted by animal rights campaigners worldwide.
Su Changlan's lawyer says the authorities may be deliberately dragging out the legal process to prolong her detention.