Fast boomerang-shaped UFO over Singapore

On October 6, 2017, a boomerang-shaped UFO looking like a cloud is appeared over Singapore, in Asia. It was flying towards east at fast speed.

Eyewitness statement:

I am staying at the last level of my block (level 16). I was tending to my plants at 10.50pm on the stated date. It was a very clear and cloudless night when I looked up and saw this boomerang like "cloud" flying by. The "cloud" has a very faint body and it maintained its shape while speeding past. Wind direction at this time is towards northeast but I observed it flying directly towards east direction. I estimate it to be about 2km away from where I am looking. It covered the entire distance from left to right in just a mere couple of seconds.

There is no light nor sound coming from the object. Attached is not the actual picture but a photo of the view which I added the "cloud" to illustrate what I witnessed. The size of the "cloud" illustrated in the picture is exactly the size in relative to the buildings below.