Yah, I saw it too. Was at Changi Point, standing with the hawker centre behind me and I was facing towards Tekong. My baby girl started shouting "See! See!" I looked up and saw the streak of blue-green light streaking across from the left to the right. i.e. it would have flew over Singapore, probably over Changi Airport too. The light was not a small blip, it was bright and the longish, just like fireworks. If you extend your arm out and close your palm, the streak of light would have been as long as the width of it. It was not that high, but high enough to just hide behind the low lying clouds.