Rare fire rainbow is spotted in Singapore. A rare 'fire rainbow' formed in the skies of Singapore on Monday for just 15 minutes.The incredible ball of multi-coloured light formed 'out of nowhere' behind a cloud on Monday afternoon in North-East District, Singapore. It was so bright that onlookers even mistook it at first for a UFO as it loomed ominously across the skyline.Fire rainbows - also known as circumhorizontal arcs - are a rare occurrence caused by light bursting through cirrus clouds at high altitude.Subscribe to Millennial News!https://goo.gl/6YeI1eFollow us on:Our twitter: https://twitter.com/Newsmill7Our facebook: https://www.facebook.com/mi...Our google plus: https://plus.google.com/+Mi...