On the eve of China's national day, 17 letter bombs exploded in southern China with blasts in multiple locations including government offices.
Seven people were killed and 51 injured.
The explosions occurred in at least 13 locations including a prison, a government office and a shopping centre in the rural county of Liucheng in the Guangxi region.
Liucheng, near the Vietnam border is home to about 400,000 people and is one of China's poorest regions.
Pictures posted online showed portions of six-storey buildings gutted and collapsed, and streets littered with glass, bricks and other debris.