Explosion on cruise ship kills 2, injures 20 By RICHARD BRAND rbrand@herald.com A boiler room explosion aboard the SS Norway, docked in the port of Miami-Dade, killed two and injured at least 20 crew members and startled tourists returning from a one-week carribean vacation. The blast does not appear to be an act of terrorism, just ''an unfortunate accident,'' according to a senior Miami-Dade police officer. However, additional police were moved to the port as a precaution. Nearly 50 Fire-Rescue units from Miami-Dade County, city of Miami, and Miami Beach responded to the explosion, which occured around 6:30 a.m. The...