I was late coming home today b/c the orange line was really slow. Usually it's a quick ride, but today we just sat in the station for a while. The conductor finally said there was police activity at one of the stations so the subway was running with delays. I finally made it to my stop (incidentally the station where the police investigation was ongoing). I saw the police cars, but no sign of any policemen. Can't imagine what they were investigating that would slow down all the trains (especially since they were nowhere to be found!) Apologies to my friends I invited over for dinner who had to wait out in the cold.