I work as a security guard at a pretty big company, this facility is for shipping / receiving, and has a few large warehouses and a passive infra red motion detector security system. It was around 10:00 when the alarm went off, and the flood lights on the fence switched on. I went out to look, and didn't see anything on the ground near the area the alarm was tripped at. I then glanced around at the treeline which is about 40ft from the fence, and noticed out of the corner of my eye three dim lights above the top of the trees. They were in a triangular configuration, pointy like, but it wasn't an airplane. It was moving too slowly and not correctly for it to be an airplane. I shined my torch at it and it quickly moved out of the beam. When it passed over the high tension lines toward the back of the complex, there was a slight static like sound coming from that direction and the lines themselves sparked slightly. I ran back inside to get the other night guard and my rifle, and when I came out it was a little farther along in the direction it had been going. Both me and my coworker saw it and neither of us were under the influence or anything. I shouldered my rifle and looked at the triangle through the scope, and could only see a dull metallic color, not shiny from between the three lights. After that it accelerated in the direction it was going and quickly was out of sight. I called the local sheriff to report it, and a man who said he was from the FBI came and took my statement, I said basically what I said here, and he left, and never called back.