Today, two plainclothes officers spotted a man smoking between cars on the Broad Street Line (BSL). Asking him to put it out, they escorted the man off the train at Allegheny Station. The man drew a gun, pointing it at the officers. To this, the officers shot him in the shoulder.
More information here: http://www.philly.com/philly/hp/news_update/20080220_Transit_cop_shoots_armed_man_at_Broad_Street_stop.html