Streets were blocked by Boston PD. Some nut detonates a homemade backpack bomb loaded with ball bearings, 10 penney nails or wrapped in prenotched wire, game over regardless. My .38 would be about as useful as a milk bucket under a bull. Better off packing a large first aid kit to help deal with the wounded. Look what happened at the Boston Marathon finish line. Plenty of cops. Some of them got hurt as well.