I was in my home on the phone,it was midnight, when I wondered where my dog was, I went outside to find my dog hiding frightened on the west side of my house, when I looked to the east, I saw fireballs, it was pitch black outside that night, the moon had gone down early, so you could not miss them, they looked like small sun's, hovering over a pond near the road on my property. At first I thought maybe they were a pole mounted transformers on fire, so I got into my car with my friend Doug to check it out. I chased the objects down Balmer road for approx 7km's, then they chased me back at high speed over 100km/hr, and returned to the same pond. They looked like Basketball sized fireballs at first, then transformed into mechanical craft with mutiple bright lights rotating, shining down at a 45 degree angle onto the pond staying there for 4 hours, at about tree height, 10 to 40 feet. The objects had very smooth actions, almost fluid in movement, able to speed up very fast, they for the most part hovered up and down in trees over the pond. There was a very unusual metallic smell asociated with this. The object at it's closest to me was about 40 feet, and the closest to the ground they got was 5 feet.I want to add that this occurance was very disturbing, left me shaking for 2 weeks.I am a motorcycle technician by trade, used to engineering principles, these craft appeared mechanically structured, with intense lights shining down.I walked the pond area, over the next few days with friends but could not find any evidence of what had happened, only to say that at the time the pond was alive with spring life, insects hatching,frogs, beaver etc.