No sound. Incredible vertical speed.During the evening of Dec 31st 2000 I witnessed a clyrindrical object moving slowly against the backdrop of the mountains surrounding Kabul. At the bottom of the cylinder were green and red pulsating lights. The object moved slowly from left to right for about 5 minuites and then abruptly rose vertically and dissapeared into the clouds at a very fast rate. Looking at the same view the next morning and judging the distances, I estimate the object was about 100 mtrs long and about 20mtrs high. I could hear no sounds at the time that made me think that the object was under jet propulsion, indeed, at that time there were no aircraft anywhere near the area.