We've been on holidays at the Black Sea and we all(3 persons) saw three shimmering lights up in the sky moving very fast and playing tactical games like two built a trap for the third. One light was brighter than two others. They were able to change abrupt the direction and were also able to stand till for a long time. They were able to fly "zig-zag" and were hunting each other for several hours. After they disappeared short before dawning. All this happened around the 11th of September 2013. First it looked like stars but nothing-nor plane, nor satelite can move and change directions so fast like this. We were amazed what we've seen and for sure we will remember this for the whole life.