(Portland, OR)  --  Firefighters and police officers are among those who were hurt in a natural gas explosion in Portland.  The firefighters were investigating a gas leak yesterday morning when the blast happened.  "FOX 12" says it also destroyed three buildings -- Portland Bagelworks, Art Works Rebels Tattoo Shop and Dosha Salon and Spa.  The Bureau of Alcohol, Tobacco, Firearms and Explosives is investigating.