Bus blasts in southwestern China
Updated
Two bus explosions in southwestern China have killed at least three people and injured 14.
The official Xinhua news agency quotes officials as saying "the explosions were cases of man-made, deliberate sabotage."
Police have started roadside checks in Kunming, the capital of Yunnan province, to try to find those responsible.
The attacks come less than three weeks before the Beijing Olympic games, which China has warned could be a target of terror attacks.
Our correspondent in Beijing, Stephen McDonell, says security checks have been increased all over China in the weeks leading up to the Olympic Games, especially in the capital Beijing, where cars are being searched as they approach the Olympic city from neighbouring provinces.
Disgruntled workers
China has occasionally witnessed bus explosions staged by disgruntled farmers or laid-off workers wanting to air grievances over poverty, demolitions or corruption.
The Kunming blasts come two days after Yunnan police opened fire and killed two rubber farmers in the province's Menglian county in a clash that also saw 41 police officers injured.
State media says the clash was sparked when police tried to arrest five people in Menglian for allegedly attacking a local rubber company in a long-running dispute between farmers and the private firm.
Chinese authorities have directed officials to redress local residents' grievances and act on complaints to try to resolve disputes and ensure a "harmonious social atmosphere" in the Olympics period.
