Many lights fly in line across the sky

I was out walking the dogs in the morning while it was still dark.  When i saw what a first thought was a satellite moving across the sky.  But after i while i saw another one right behind the first one flying in the same line.  This kept going and it looked like a dotted string moving across the sky.  There where like 30-40 lights following the same path with almost the same distance between everyone of them.  They flew a bit faster than the airplanes in the sky at that moment.
At one time it seemed the 2 last lights stopped for a moment before moving along.
The lights was brighter than most of the stars.
I dont know if satellites fly in in groups following the same path.  But not according to a live satellite map.
The distance between the lights is hard to tell.  But if you hold a ruler in stretched arm in front of the sight it was about 10-15centimeter between the lights.
The event lasted between 5 and 10 minutes before all of the lights was out of sight.