Kem Ley - a prominent Cambodian political commentator and critic of the government - has been shot dead, local media say. They quote police as saying he was killed at a petrol station in the capital Phnom Penh. A suspect was later arrested, reports say. The motive of the attack was not immediately known. http://www.bbc.com/news/world-asia-36757370?ocid=socialflow_twitter%3FSThisFB