What? A circling rainbow?

Singapore, yesterday, had an unusual sighting. A halo around the sun indeed. Scientifically it's named an "icebow". Here's a "borrowed" picture from STOMP of the rare phenomenon:


Quoted from Wikipedia:
"An icebow is phenomenon similar to a rainbow except that it is formed by the refraction of sunlight through cloud suspended ice crystals as opposed to raindrops or other liquid water suspended in the air."