2014年CRI 男子贵阳公交纵火致6死35伤（在线收听）

Police in Guizhou province say they have established a motive for Thursday's deadly bus arson that killed six people.

They say the suspect, surnamed Su, believed his wife was having an affair, and thus he "took revenge on society" by igniting a barrel of gasoline on the bus.

A four month old boy is among the six people killed. 35 others were injured. Survivors say the flames spread quickly.

The suspect was slightly injured in the fire - he was formally arrested on Friday.

The Chinese government has taken a major step to improve the competitiveness of the nation's oil and gas exploration sector.

A variety of equipment vital to the industry has been added to China's duty-free list, including drilling equipment, semi-submersible drilling rigs, liquified natural gas carriers, and several other pieces vital to exploration and high-end manufactoring.

The measure takes effect on Saturday.