With the approach of the G20 Summit in Hangzhou, Zhejiang province, authorities have imposed rules to manage small aircraft and "flying objects" - including unmanned aerial vehicles, or drones.

The gathering, for the governments and central bank governors of 20 major world economies, will be held in Hangzhou on Sept 4 and 5.

It has been held twice a year since 2000 and is designed to enhance international economic cooperation and decision-making.