Last Sunday at 8:40pm, officials of Suyu National Forrest Park in Yinchuan City, Ningxia Hui Autonomous Region saw what appeared to be two “flying houses” on surveillance footage. The odd things stayed in the sky for nearly half-hour before rising up. At about 9:40pm, more “houses” appeared, forming a fleet. The things gradually disappeared by 11:10pm. There is no scientific explanation yet. It could be UFO or optical illusion? What do you think? Share with us your opinions.