The first report you linked is a 2009
The second one is current and very depressing, but a theme well known to the point that it is sadly not news worthy unless a slow news day or martial law is declared and the locals are defying curfew. the Chines government is very apt at suppressing news information not only within it's own borders but what flows out as well so the best you get are unconfirmed reports of X, Y, Z 
Indeed. I just got a little ahead of myself there. It's front page news on the WSJ.
Google news says nothing
Yeaaaa, well that's Google for you. They have to get their stuff screened before showing it in China, right?
I have actually heard nothing about this.
Don't feel left out. This isn't really news. Some guy named Wiener showing his dick is. Bombings and riots in China aren't.
http://www.bloomberg.com/news/2011-06-13/china-cracks-down-in-wake-of-riots-bombings.htmlHere's Bloomberg from yesterday.
Officials in central China’s Hubei province were suspended or detained after protests last week sparked by the death of a local councilman, reflecting rising public anger at abuse of power and a widening income gap.
...
Armored cars were used to quell protests on June 9 that were sparked by Ran’s death, with people throwing bottles and eggs as they clashed with police, the AP reported, citing local witnesses. Riots, strikes and protests are on the rise as inequality grows and people lash out at corrupt local governments seeking to generate income by selling homes and farms to real-estate developers at a profit.
Seems like largely migrant workers. I don't know how many locals are actually participating.
Unfortunately we'll have to rely on the Guardian for more information.
Rioters burned police and fire vehicles in a third day of unrest in southern China's manufacturing heartlands, witnesses have reported.
Hong Kong broadcasters reported that armed police fired teargas as they sought to disperse the crowd and detained at least a dozen demonstrators.
The clashes, which began on Friday after a fracas between security officers and a pregnant street vendor in Xintang, Guangdong province, highlight Chinese authorities' struggle to control social frustrations. It is thought that most protesters were migrant workers like the vendor.
Well I'll be waiting to see if anything happens.
http://www.guardian.co.uk/world/2011/jun/13/china-riots-enter-third-day