See the stunning images in the 4th annual International Drone Photography Contest
Knife-wielding assailants attacked people at a train station in southwestern China on Saturday in what authorities called a terrorist attack. The assailants killed 29 people, and four of the attackers were killed by police, the government-run Xinhua News Agency said
The contest is accepting entries in one or all of four categories: wildlife, landscapes, underwater and aerials. The grand-prize winner will receive $10,000, publication in National Geographic Magazine and a feature on National Geographic’s Instagram account.