I don't know if I had any symptoms prior to the failure. The only noise I experienced is a clicking or ticking for about 2 seconds after startup. I thought this was valvetrain noise.
The tensioner is a rachet type and seems to still be operational. The rail on the right has some small pieces broken off, but this may have occured as a result of the broken chain. I don't think so, because the did not fully come off the camshaft.
The chain broke by pulling a link pin through the hole. I will try to attach a picture of the chain.
I have not turned the cam yet to see if it had siezed.