Oil drops on rising U.S. rig count

By Christopher Johnson LONDON (Reuters) - Oil prices fell on Friday as a rising U.S. rig count stoked fears of global oversupply and after Chinese regulators opened an investigation into suspected stock market manipulation. U.S. oil drilling increased this week for the first time after 29 weeks of declines, a sign U.S. oil production may start to increase more strongly again after a slowdown due to a period of low oil prices. Oil rigs increased by 12 to 640 following a slump that cut the number