Black Triangle-Boston DocksIt was roughly 16:40, 6th April. I had just cycled past the Redstone Industrial Estate, gone down a little bicycle path which goes beneath Spalding Road and was just lifting my bike over the Somerfield supermarket fence to cross the carpark(to shave a minute or two off my time)and I saw a black triangle over the docks, about 1/4 mile away.I first thought that it was a helicopeter, this was because it looked to be too small to be a plane and was moving too slowly. I soon began to doubt this because I was not aware of any noise coming from it. It moved slowly, not much faster than jogging pace. It was also not too far from the ground either. The triangle was near a 6 storey office block on the dock, and was only 30 feet higher than that.I put my bike down, and started to walk towards some moorings, on the opposite side of the river from the triangle. I had only taken a few steps and then it just shot into the sky and over my head it went. It was quite a sight.((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))